diff --git a/app.json b/app.json
index 6dbed32..76e9b05 100644
--- a/app.json
+++ b/app.json
@@ -2,8 +2,12 @@
   "expo": {
     "name": "Alby Go",
     "slug": "alby-mobile",
-    "version": "1.4.2",
-    "scheme": ["bitcoin", "lightning", "alby"],
+    "version": "1.5.0",
+    "scheme": [
+      "bitcoin",
+      "lightning",
+      "alby"
+    ],
     "orientation": "portrait",
     "icon": "./assets/icon.png",
     "userInterfaceStyle": "automatic",
@@ -12,8 +16,16 @@
       "resizeMode": "cover",
       "backgroundColor": "#0F0C40"
     },
-    "assetBundlePatterns": ["**/*"],
+    "assetBundlePatterns": [
+      "**/*"
+    ],
     "plugins": [
+      [
+        "expo-local-authentication",
+        {
+          "faceIDPermission": "Allow Alby Go to use Face ID."
+        }
+      ],
       [
         "expo-camera",
         {
@@ -49,7 +61,9 @@
         "foregroundImage": "./assets/adaptive-icon.png",
         "backgroundImage": "./assets/adaptive-icon-bg.png"
       },
-      "permissions": ["android.permission.CAMERA"]
+      "permissions": [
+        "android.permission.CAMERA"
+      ]
     },
     "extra": {
       "eas": {
@@ -58,4 +72,4 @@
     },
     "owner": "roland_alby"
   }
-}
+}
\ No newline at end of file
diff --git a/app/_layout.tsx b/app/_layout.tsx
index 642c92b..be4d78d 100644
--- a/app/_layout.tsx
+++ b/app/_layout.tsx
@@ -21,9 +21,12 @@ import { toastConfig } from "~/components/ToastConfig";
 import * as Font from "expo-font";
 import { useInfo } from "~/hooks/useInfo";
 import { secureStorage } from "~/lib/secureStorage";
-import { hasOnboardedKey } from "~/lib/state/appStore";
+import { hasOnboardedKey, useAppStore } from "~/lib/state/appStore";
+import { usePathname } from "expo-router";
+import { UserInactivityProvider } from "~/context/UserInactivity";
 import { PortalHost } from '@rn-primitives/portal';
 import { GestureHandlerRootView } from "react-native-gesture-handler";
+import { isBiometricSupported } from "~/lib/isBiometricSupported";
 
 const LIGHT_THEME: Theme = {
   dark: false,
@@ -50,6 +53,8 @@ export default function RootLayout() {
   const { isDarkColorScheme } = useColorScheme();
   const [fontsLoaded, setFontsLoaded] = React.useState(false);
   const [checkedOnboarding, setCheckedOnboarding] = React.useState(false);
+  const isUnlocked = useAppStore((store) => store.unlocked);
+  const pathname = usePathname();
   useConnectionChecker();
 
   const rootNavigationState = useRootNavigationState();
@@ -65,7 +70,6 @@ export default function RootLayout() {
   };
 
   async function loadFonts() {
-
     await Font.loadAsync({
       OpenRunde: require("./../assets/fonts/OpenRunde-Regular.otf"),
       "OpenRunde-Medium": require("./../assets/fonts/OpenRunde-Medium.otf"),
@@ -76,12 +80,20 @@ export default function RootLayout() {
     setFontsLoaded(true);
   }
 
+  async function checkBiometricStatus() {
+    const isSupported = await isBiometricSupported()
+    if (!isSupported) {
+      useAppStore.getState().setSecurityEnabled(false);
+    }
+  }
+
   React.useEffect(() => {
     const init = async () => {
       try {
         await Promise.all([
           checkOnboardingStatus(),
           loadFonts(),
+          checkBiometricStatus(),
         ]);
       }
       finally {
@@ -90,9 +102,16 @@ export default function RootLayout() {
     };
 
     init();
-
   }, [hasNavigationState]);
 
+  React.useEffect(() => {
+    if (hasNavigationState && !isUnlocked) {
+      if (pathname !== "/unlock") {
+        router.push("/unlock");
+      }
+    }
+  }, [isUnlocked, hasNavigationState]);
+
   if (!fontsLoaded || !checkedOnboarding) {
     return null;
   }
@@ -104,7 +123,9 @@ export default function RootLayout() {
         <PolyfillCrypto />
         <SafeAreaView className="w-full h-full bg-background">
           <GestureHandlerRootView>
-            <Stack />
+            <UserInactivityProvider>
+              <Stack />
+            </UserInactivityProvider>
             <Toast config={toastConfig} position="bottom" bottomOffset={140} topOffset={140} />
             <PortalHost />
           </GestureHandlerRootView>
diff --git a/app/settings/security.js b/app/settings/security.js
new file mode 100644
index 0000000..1dca538
--- /dev/null
+++ b/app/settings/security.js
@@ -0,0 +1,5 @@
+import { Security } from "../../pages/settings/Security";
+
+export default function Page() {
+  return <Security />;
+}
diff --git a/app/unlock.js b/app/unlock.js
new file mode 100644
index 0000000..b17a77d
--- /dev/null
+++ b/app/unlock.js
@@ -0,0 +1,5 @@
+import { Unlock } from "../pages/Unlock";
+
+export default function Page() {
+  return <Unlock />;
+}
diff --git a/components/DualCurrencyInput.tsx b/components/DualCurrencyInput.tsx
index b18958d..bebedc5 100644
--- a/components/DualCurrencyInput.tsx
+++ b/components/DualCurrencyInput.tsx
@@ -11,12 +11,14 @@ type DualCurrencyInputProps = {
   amount: string;
   setAmount(amount: string): void;
   autoFocus?: boolean;
+  readOnly?: boolean;
 };
 
 export function DualCurrencyInput({
   amount,
   setAmount,
   autoFocus = false,
+  readOnly = false,
 }: DualCurrencyInputProps) {
   const getFiatAmount = useGetFiatAmount();
   const getSatsAmount = useGetSatsAmount();
@@ -58,6 +60,7 @@ export function DualCurrencyInput({
         style={styles.amountInput}
         autoFocus={autoFocus}
         returnKeyType="done"
+        readOnly={readOnly}
       // aria-errormessage="inputError"
       />
       <Pressable onPress={toggleInputMode}>
diff --git a/components/Icons.tsx b/components/Icons.tsx
index a40dbac..51d14a2 100644
--- a/components/Icons.tsx
+++ b/components/Icons.tsx
@@ -34,8 +34,10 @@ import {
   CameraOff,
   Palette,
   Egg,
+  Fingerprint,
   HelpCircle,
   CircleCheck,
+  TriangleAlert,
 } from "lucide-react-native";
 import { cssInterop } from "nativewind";
 
@@ -85,8 +87,10 @@ interopIcon(Power);
 interopIcon(CameraOff);
 interopIcon(Palette);
 interopIcon(Egg);
+interopIcon(Fingerprint);
 interopIcon(HelpCircle);
 interopIcon(CircleCheck);
+interopIcon(TriangleAlert);
 
 export {
   AlertCircle,
@@ -123,6 +127,8 @@ export {
   Power,
   Palette,
   Egg,
+  Fingerprint,
   HelpCircle,
   CircleCheck,
+  TriangleAlert,
 };
diff --git a/components/ui/switch.tsx b/components/ui/switch.tsx
new file mode 100644
index 0000000..951716d
--- /dev/null
+++ b/components/ui/switch.tsx
@@ -0,0 +1,96 @@
+import * as SwitchPrimitives from '@rn-primitives/switch';
+import * as React from 'react';
+import { Platform } from 'react-native';
+import Animated, {
+  interpolateColor,
+  useAnimatedStyle,
+  useDerivedValue,
+  withTiming,
+} from 'react-native-reanimated';
+import { useColorScheme } from '~/lib/useColorScheme';
+import { cn } from '~/lib/utils';
+
+const SwitchWeb = React.forwardRef<
+  React.ElementRef<typeof SwitchPrimitives.Root>,
+  React.ComponentPropsWithoutRef<typeof SwitchPrimitives.Root>
+>(({ className, ...props }, ref) => (
+  <SwitchPrimitives.Root
+    className={cn(
+      'peer flex-row h-6 w-11 shrink-0 cursor-pointer items-center rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed',
+      props.checked ? 'bg-amber-300' : 'bg-input',
+      props.disabled && 'opacity-50',
+      className
+    )}
+    {...props}
+    ref={ref}
+  >
+    <SwitchPrimitives.Thumb
+      className={cn(
+        'pointer-events-none block h-5 w-5 rounded-full bg-background shadow-md shadow-foreground/5 ring-0 transition-transform',
+        props.checked ? 'translate-x-5' : 'translate-x-0'
+      )}
+    />
+  </SwitchPrimitives.Root>
+));
+
+SwitchWeb.displayName = 'SwitchWeb';
+
+const RGB_COLORS = {
+  light: {
+    primary: 'rgb(255, 224, 112)',
+    input: 'rgb(228, 228, 231)',
+  },
+  dark: {
+    primary: 'rgb(255, 224, 112)',
+    input: 'rgb(228, 228, 231)',
+  },
+} as const;
+
+const SwitchNative = React.forwardRef<
+  React.ElementRef<typeof SwitchPrimitives.Root>,
+  React.ComponentPropsWithoutRef<typeof SwitchPrimitives.Root>
+>(({ className, ...props }, ref) => {
+  const { colorScheme } = useColorScheme();
+  const translateX = useDerivedValue(() => (props.checked ? 18 : 0));
+  const animatedRootStyle = useAnimatedStyle(() => {
+    return {
+      backgroundColor: interpolateColor(
+        Number(props.checked),
+        [0, 1],
+        [RGB_COLORS[colorScheme].input, RGB_COLORS[colorScheme].primary]
+      ),
+    };
+  });
+  const animatedThumbStyle = useAnimatedStyle(() => ({
+    transform: [{ translateX: withTiming(translateX.value, { duration: 200 }) }],
+  }));
+  return (
+    <Animated.View
+      style={animatedRootStyle}
+      className={cn('h-8 w-[46px] rounded-full', props.disabled && 'opacity-50')}
+    >
+      <SwitchPrimitives.Root
+        className={cn(
+          'flex-row h-8 w-[46px] shrink-0 items-center rounded-full border-2 border-transparent',
+          className
+        )}
+        {...props}
+        ref={ref}
+      >
+        <Animated.View style={animatedThumbStyle}>
+          <SwitchPrimitives.Thumb
+            className={'h-7 w-7 rounded-full bg-background shadow-md shadow-foreground/25 ring-0'}
+          />
+        </Animated.View>
+      </SwitchPrimitives.Root>
+    </Animated.View>
+  );
+});
+SwitchNative.displayName = 'SwitchNative';
+
+const Switch = Platform.select({
+  web: SwitchWeb,
+  default: SwitchNative,
+});
+
+export { Switch };
diff --git a/context/UserInactivity.tsx b/context/UserInactivity.tsx
new file mode 100644
index 0000000..2133fd7
--- /dev/null
+++ b/context/UserInactivity.tsx
@@ -0,0 +1,42 @@
+import * as React from "react";
+import { AppState, AppStateStatus, NativeEventSubscription } from 'react-native';
+import { secureStorage } from "~/lib/secureStorage";
+import { INACTIVITY_THRESHOLD } from "~/lib/constants";
+import { lastActiveTimeKey, useAppStore } from "~/lib/state/appStore";
+
+export const UserInactivityProvider = ({ children }: any) => {
+  const [appState, setAppState] = React.useState<AppStateStatus>(AppState.currentState);
+  const isSecurityEnabled = useAppStore((store) => store.isSecurityEnabled);
+
+  const handleAppStateChange = async (nextState: AppStateStatus) => {
+    if (appState === "active" && nextState.match(/inactive|background/)) {
+      const now = Date.now();
+      secureStorage.setItem(lastActiveTimeKey, now.toString());
+    } else if (appState.match(/inactive|background/) && nextState === "active") {
+      const lastActiveTime = secureStorage.getItem(lastActiveTimeKey);
+      if (lastActiveTime) {
+        const timeElapsed = Date.now() - parseInt(lastActiveTime, 10);
+        if (timeElapsed >= INACTIVITY_THRESHOLD) {
+          useAppStore.getState().setUnlocked(false)
+        }
+      }
+      await secureStorage.removeItem(lastActiveTimeKey);
+    }
+    setAppState(nextState);
+  };
+
+  React.useEffect(() => {
+    let subscription: NativeEventSubscription
+    if (isSecurityEnabled) {
+      subscription = AppState.addEventListener("change", handleAppStateChange);
+    }
+
+    return () => {
+      if (subscription) {
+        subscription.remove();
+      }
+    };
+  }, [appState, isSecurityEnabled]);
+  
+  return children;
+}
\ No newline at end of file
diff --git a/lib/constants.ts b/lib/constants.ts
index 46c2eae..5cae282 100644
--- a/lib/constants.ts
+++ b/lib/constants.ts
@@ -17,6 +17,8 @@ export const NAV_THEME = {
   },
 };
 
+export const INACTIVITY_THRESHOLD = 5 * 60 * 1000;
+
 export const CURSOR_COLOR = "hsl(47 100% 72%)";
 
 export const TRANSACTIONS_PAGE_SIZE = 20;
diff --git a/lib/isBiometricSupported.ts b/lib/isBiometricSupported.ts
new file mode 100644
index 0000000..bcbefd4
--- /dev/null
+++ b/lib/isBiometricSupported.ts
@@ -0,0 +1,7 @@
+import * as LocalAuthentication from "expo-local-authentication";
+
+export async function isBiometricSupported() {
+  const compatible = await LocalAuthentication.hasHardwareAsync();
+  const securityLevel = await LocalAuthentication.getEnrolledLevelAsync();
+  return compatible && securityLevel > 0
+}
\ No newline at end of file
diff --git a/lib/state/appStore.ts b/lib/state/appStore.ts
index f5a827d..fa5f151 100644
--- a/lib/state/appStore.ts
+++ b/lib/state/appStore.ts
@@ -4,11 +4,14 @@ import { nwc } from "@getalby/sdk";
 import { secureStorage } from "lib/secureStorage";
 
 interface AppState {
+  readonly unlocked: boolean;
   readonly nwcClient: NWCClient | undefined;
   readonly fiatCurrency: string;
   readonly selectedWalletId: number;
   readonly wallets: Wallet[];
   readonly addressBookEntries: AddressBookEntry[];
+  readonly isSecurityEnabled: boolean;
+  setUnlocked: (unlocked: boolean) => void;
   setNWCClient: (nwcClient: NWCClient | undefined) => void;
   setNostrWalletConnectUrl(nostrWalletConnectUrl: string): void;
   removeNostrWalletConnectUrl(): void;
@@ -16,6 +19,7 @@ interface AppState {
   removeCurrentWallet(): void;
   setFiatCurrency(fiatCurrency: string): void;
   setSelectedWalletId(walletId: number): void;
+  setSecurityEnabled(securityEnabled: boolean): void;
   addWallet(wallet: Wallet): void;
   addAddressBookEntry(entry: AddressBookEntry): void;
   reset(): void;
@@ -26,7 +30,9 @@ const walletKeyPrefix = "wallet";
 const addressBookEntryKeyPrefix = "addressBookEntry";
 const selectedWalletIdKey = "selectedWalletId";
 const fiatCurrencyKey = "fiatCurrency";
+export const isSecurityEnabledKey = "isSecurityEnabled";
 export const hasOnboardedKey = "hasOnboarded";
+export const lastActiveTimeKey = "lastActiveTime";
 
 type Wallet = {
   name?: string;
@@ -99,7 +105,15 @@ export const useAppStore = create<AppState>()((set, get) => {
   const removeCurrentWallet = () => {
     const wallets = [...get().wallets];
     if (wallets.length <= 1) {
-      // cannot delete last wallet
+      // set to initial wallet status
+      secureStorage.removeItem(hasOnboardedKey);
+      secureStorage.setItem(selectedWalletIdKey, "0");
+      secureStorage.setItem(getWalletKey(0), JSON.stringify({}));
+      set({
+        nwcClient: undefined,
+        selectedWalletId: 0,
+        wallets: [{}],
+      });
       return;
     }
     const selectedWalletId = get().selectedWalletId;
@@ -124,15 +138,23 @@ export const useAppStore = create<AppState>()((set, get) => {
   const initialSelectedWalletId = +(
     secureStorage.getItem(selectedWalletIdKey) || "0"
   );
+
+  const iSecurityEnabled = secureStorage.getItem(isSecurityEnabledKey) === "true";
+
   const initialWallets = loadWallets();
   return {
+    unlocked: !iSecurityEnabled,
     addressBookEntries: loadAddressBookEntries(),
     wallets: initialWallets,
     nwcClient: getNWCClient(initialSelectedWalletId),
     fiatCurrency: secureStorage.getItem(fiatCurrencyKey) || "",
+    isSecurityEnabled: iSecurityEnabled,
     selectedWalletId: initialSelectedWalletId,
     updateCurrentWallet,
     removeCurrentWallet,
+    setUnlocked: (unlocked) => {
+      set({ unlocked });
+    },
     setNWCClient: (nwcClient) => set({ nwcClient }),
     removeNostrWalletConnectUrl: () => {
       updateCurrentWallet({
@@ -146,6 +168,13 @@ export const useAppStore = create<AppState>()((set, get) => {
         nostrWalletConnectUrl,
       });
     },
+    setSecurityEnabled: (isEnabled) => {
+      secureStorage.setItem(isSecurityEnabledKey, isEnabled.toString());
+      set({
+        isSecurityEnabled: isEnabled,
+        ...(!isEnabled ? { unlocked: true } : {}),
+      });
+    },
     setFiatCurrency: (fiatCurrency) => {
       secureStorage.setItem(fiatCurrencyKey, fiatCurrency);
       set({ fiatCurrency });
@@ -191,18 +220,27 @@ export const useAppStore = create<AppState>()((set, get) => {
       for (let i = 0; i < get().addressBookEntries.length; i++) {
         secureStorage.removeItem(getAddressBookEntryKey(i));
       }
-      // clear selected wallet ID
-      secureStorage.removeItem(selectedWalletIdKey);
+
+      // clear fiat currency
+      secureStorage.removeItem(fiatCurrencyKey);
+
+      // clear security enabled status
+      secureStorage.removeItem(isSecurityEnabledKey);
 
       // clear onboarding status
       secureStorage.removeItem(hasOnboardedKey);
 
+      // set to initial wallet status
+      secureStorage.setItem(selectedWalletIdKey, "0");
+      secureStorage.setItem(getWalletKey(0), JSON.stringify({}));
+
       set({
         nwcClient: undefined,
         fiatCurrency: undefined,
-        selectedWalletId: undefined,
-        wallets: [],
+        selectedWalletId: 0,
+        wallets: [{}],
         addressBookEntries: [],
+        isSecurityEnabled: false,
       });
     },
   };
diff --git a/package.json b/package.json
index bbfe632..ef13127 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "alby-go",
-  "version": "1.4.2",
+  "version": "1.5.0",
   "main": "expo-router/entry",
   "scripts": {
     "start": "expo start",
@@ -21,6 +21,7 @@
     "@react-native-async-storage/async-storage": "1.23.1",
     "@rn-primitives/dialog": "^1.0.3",
     "@rn-primitives/portal": "^1.0.3",
+    "@rn-primitives/switch": "^1.0.3",
     "bech32": "^2.0.0",
     "buffer": "^6.0.3",
     "class-variance-authority": "^0.7.0",
@@ -34,6 +35,7 @@
     "expo-font": "^12.0.9",
     "expo-linear-gradient": "~13.0.2",
     "expo-linking": "~6.3.1",
+    "expo-local-authentication": "~14.0.1",
     "expo-router": "^3.5.23",
     "expo-secure-store": "^13.0.2",
     "expo-status-bar": "~1.12.1",
@@ -53,7 +55,7 @@
     "react-native-toast-message": "^2.2.0",
     "react-native-url-polyfill": "^2.0.0",
     "react-native-webview": "13.8.6",
-    "react-native-webview-crypto": "^0.0.25",
+    "react-native-webview-crypto": "^0.0.26",
     "swr": "^2.2.5",
     "tailwind-merge": "^2.3.0",
     "text-encoding": "^0.7.0",
diff --git a/pages/Unlock.tsx b/pages/Unlock.tsx
new file mode 100644
index 0000000..d2110b0
--- /dev/null
+++ b/pages/Unlock.tsx
@@ -0,0 +1,56 @@
+import { router, Stack } from "expo-router";
+import React from "react";
+import { View, Image } from "react-native";
+import * as LocalAuthentication from "expo-local-authentication";
+
+import { Button } from "~/components/ui/button";
+import { Text } from "~/components/ui/text";
+import { useAppStore } from "~/lib/state/appStore";
+
+export function Unlock() {
+  const [isUnlocking, setIsUnlocking] = React.useState(false);
+
+  const handleUnlock = async () => {
+    try {
+      setIsUnlocking(true);
+      const biometricAuth = await LocalAuthentication.authenticateAsync({
+        promptMessage: "Unlock Alby Go",
+      });
+      if (biometricAuth.success) {
+        useAppStore.getState().setUnlocked(true);
+        if (router.canGoBack()) {
+          router.back();
+        } else {
+          router.replace("/");
+        }
+      }
+    } finally {
+      setIsUnlocking(false);
+    }
+  };
+
+  React.useEffect(() => {
+    handleUnlock();
+  }, []);
+
+  return (
+    <View className="flex-1 flex flex-col p-6 gap-3">
+      <Stack.Screen
+        options={{
+          title: "Unlock",
+          headerShown: false,
+        }}
+      />
+      <View className="flex-1 flex items-center justify-center gap-4">
+        <Image
+          source={require('./../assets/logo.png')}
+          className="mb-10 w-52 h-52 object-contain"
+        />
+        <Text className="font-semibold2 text-4xl text-center text-foreground">Unlock to continue</Text>
+      </View>
+      <Button size="lg" onPress={handleUnlock} disabled={isUnlocking}>
+        <Text>{isUnlocking ? "Unlocking..." : "Unlock Wallet"}</Text>
+      </Button>
+    </View>
+  );
+}
diff --git a/pages/receive/Receive.tsx b/pages/receive/Receive.tsx
index 18c7f50..177fd2f 100644
--- a/pages/receive/Receive.tsx
+++ b/pages/receive/Receive.tsx
@@ -101,7 +101,7 @@ export function Receive() {
                 polling &&
                 pollCount > 0 &&
                 receivedTransaction.payment_hash !==
-                  prevTransaction?.payment_hash
+                prevTransaction?.payment_hash
               ) {
                 if (
                   !invoiceRef.current ||
@@ -176,7 +176,10 @@ export function Receive() {
 
   return (
     <>
-      <Screen title="Receive" />
+      <Screen
+        title="Receive"
+        animation="slide_from_left"
+      />
       {!enterCustomAmount && !invoice && !lightningAddress && (
         <>
           <View className="flex-1 h-full flex flex-col items-center justify-center gap-5">
diff --git a/pages/send/LNURLPay.tsx b/pages/send/LNURLPay.tsx
index c3c3120..bd410a3 100644
--- a/pages/send/LNURLPay.tsx
+++ b/pages/send/LNURLPay.tsx
@@ -1,6 +1,6 @@
 import Screen from "~/components/Screen";
 import { router, useLocalSearchParams } from "expo-router";
-import React from "react";
+import React, { useEffect } from "react";
 import { View } from "react-native";
 import { Button } from "~/components/ui/button";
 import { Text } from "~/components/ui/text";
@@ -21,6 +21,15 @@ export function LNURLPay() {
   const [isLoading, setLoading] = React.useState(false);
   const [amount, setAmount] = React.useState("");
   const [comment, setComment] = React.useState("");
+  const [isAmountReadOnly, setAmountReadOnly] = React.useState(false);
+
+  useEffect(() => {
+    // Handle fixed amount LNURLs
+    if (lnurlDetails.minSendable === lnurlDetails.maxSendable) {
+      setAmount((lnurlDetails.minSendable / 1000).toString());
+      setAmountReadOnly(true);
+    }
+  }, [lnurlDetails.minSendable, lnurlDetails.maxSendable]);
 
   async function requestInvoice() {
     setLoading(true);
@@ -53,20 +62,24 @@ export function LNURLPay() {
             <DualCurrencyInput
               amount={amount}
               setAmount={setAmount}
-              autoFocus
+              readOnly={isAmountReadOnly}
+              autoFocus={!isAmountReadOnly}
             />
-            <View className="w-full">
-              <Text className="text-muted-foreground text-center font-semibold2">
-                Comment
-              </Text>
-              <Input
-                className="w-full border-transparent bg-transparent text-center native:text-2xl font-semibold2"
-                placeholder="Enter an optional comment"
-                value={comment}
-                onChangeText={setComment}
-                returnKeyType="done"
-              />
-            </View>
+            {lnurlDetails.commentAllowed &&
+              <View className="w-full">
+                <Text className="text-muted-foreground text-center font-semibold2">
+                  Comment
+                </Text>
+                <Input
+                  className="w-full border-transparent bg-transparent text-center native:text-2xl font-semibold2"
+                  placeholder="Enter an optional comment"
+                  value={comment}
+                  onChangeText={setComment}
+                  returnKeyType="done"
+                  maxLength={lnurlDetails.commentAllowed}
+                />
+              </View>
+            }
             <View>
               <Text className="text-muted-foreground text-center font-semibold2">
                 To
diff --git a/pages/send/PaymentSuccess.tsx b/pages/send/PaymentSuccess.tsx
index d5eb4cc..bda1184 100644
--- a/pages/send/PaymentSuccess.tsx
+++ b/pages/send/PaymentSuccess.tsx
@@ -19,7 +19,7 @@ export function PaymentSuccess() {
       <Screen
         title="Success"
       />
-      <View className="flex-1 justify-center items-center gap-8">
+      <View className="flex-1 justify-center items-center gap-8 p-6">
         <Paid />
         <View className="flex flex-col items-center gap-2 -mt-24">
           <View className="flex flex-row items-end justify-center">
diff --git a/pages/send/Send.tsx b/pages/send/Send.tsx
index 9f24320..923ad40 100644
--- a/pages/send/Send.tsx
+++ b/pages/send/Send.tsx
@@ -83,13 +83,29 @@ export function Send() {
           throw new Error("LNURL tag " + lnurlDetails.tag + " not supported");
         }
 
-        router.replace({
-          pathname: "/send/lnurl-pay",
-          params: {
-            lnurlDetailsJSON: JSON.stringify(lnurlDetails),
-            originalText,
-          },
-        });
+        // Handle fixed amount LNURLs
+        if (lnurlDetails.minSendable === lnurlDetails.maxSendable && !lnurlDetails.commentAllowed) {
+          try {
+            const callback = new URL(lnurlDetails.callback);
+            callback.searchParams.append("amount", (lnurlDetails.minSendable).toString());
+            const lnurlPayInfo = await lnurl.getPayRequest(callback.toString());
+            router.push({
+              pathname: "/send/confirm",
+              params: { invoice: lnurlPayInfo.pr, originalText },
+            });
+          } catch (error) {
+            console.error(error);
+            errorToast(error);
+          }
+        } else {
+          router.replace({
+            pathname: "/send/lnurl-pay",
+            params: {
+              lnurlDetailsJSON: JSON.stringify(lnurlDetails),
+              originalText,
+            },
+          });
+        }
       } else {
         // Check if this is a valid invoice
         new Invoice({
diff --git a/pages/settings/Security.tsx b/pages/settings/Security.tsx
new file mode 100644
index 0000000..ea43809
--- /dev/null
+++ b/pages/settings/Security.tsx
@@ -0,0 +1,78 @@
+import React from "react";
+import { Text, View } from "react-native";
+import { TriangleAlert } from "~/components/Icons";
+import Loading from "~/components/Loading";
+import Screen from "~/components/Screen";
+import {
+  Card,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card";
+import { Label } from "~/components/ui/label";
+import { Switch } from "~/components/ui/switch";
+import { isBiometricSupported } from "~/lib/isBiometricSupported";
+import { useAppStore } from "~/lib/state/appStore";
+import { cn } from "~/lib/utils";
+
+export function Security() {
+  const [isSupported, setIsSupported] = React.useState<boolean | null>(null);
+  const isEnabled = useAppStore((store) => store.isSecurityEnabled);
+
+  React.useEffect(() => {
+    async function checkBiometricSupport() {
+      const supported = await isBiometricSupported();
+      setIsSupported(supported);
+    }
+    checkBiometricSupport();
+  }, []);
+
+  return (
+    <View className="flex-1 p-6">
+      <Screen title="Security" />
+      {isSupported === null ? (
+        <View className="flex-1 justify-center items-center">
+          <Loading />
+        </View>
+      ) : (
+        <>
+          {!isSupported && (
+            <Card className="mb-6">
+              <CardHeader>
+                <CardTitle className="flex flex-row gap-3 items-center">
+                  <TriangleAlert size={16} className="text-foreground" />
+                  <Text> Setup Device Security</Text>
+                </CardTitle>
+                <CardDescription>
+                  To protect your wallet, please set up a phone lock in your device settings first.
+                </CardDescription>
+              </CardHeader>
+            </Card>
+          )}
+          <View className="flex-1">
+            <View className="flex-row items-center justify-between gap-2">
+              <Label
+                className={cn(
+                  "text-2xl",
+                  !isSupported && "text-muted-foreground"
+                )}
+                nativeID="security"
+                disabled={isSupported}
+              >
+                <Text className="text-lg">Require phone lock to access</Text>
+              </Label>
+              <Switch
+                checked={isEnabled}
+                disabled={!isSupported}
+                onCheckedChange={() => {
+                  useAppStore.getState().setSecurityEnabled(!isEnabled);
+                }}
+                nativeID="security"
+              />
+            </View>
+          </View>
+        </>
+      )}
+    </View>
+  );
+}
diff --git a/pages/settings/Settings.tsx b/pages/settings/Settings.tsx
index ca78a08..67ca840 100644
--- a/pages/settings/Settings.tsx
+++ b/pages/settings/Settings.tsx
@@ -1,6 +1,6 @@
 import { Link, router } from "expo-router";
 import { Alert, TouchableOpacity, View } from "react-native";
-import { Bitcoin, Egg, Palette, Power, Wallet2 } from "~/components/Icons";
+import { Bitcoin, Egg, Fingerprint, Palette, Power, Wallet2 } from "~/components/Icons";
 
 import { DEFAULT_CURRENCY, DEFAULT_WALLET_NAME } from "~/lib/constants";
 import { useAppStore } from "~/lib/state/appStore";
@@ -43,6 +43,15 @@ export function Settings() {
         </TouchableOpacity>
       </Link>
 
+      <Link href="/settings/security" asChild>
+        <TouchableOpacity className="flex flex-row gap-4">
+          <Fingerprint className="text-foreground" />
+          <Text className="text-foreground font-medium2 text-xl">
+            Security
+          </Text>
+        </TouchableOpacity>
+      </Link>
+
       <TouchableOpacity
         className="flex flex-row gap-4"
         onPress={toggleColorScheme}
diff --git a/pages/settings/wallets/EditWallet.tsx b/pages/settings/wallets/EditWallet.tsx
index 592945b..8018908 100644
--- a/pages/settings/wallets/EditWallet.tsx
+++ b/pages/settings/wallets/EditWallet.tsx
@@ -117,7 +117,12 @@ export function EditWallet() {
               {
                 text: "Confirm",
                 onPress: () => {
-                  router.back();
+                  if (useAppStore.getState().wallets.length == 1) {
+                    router.dismissAll();
+                    router.replace("/onboarding");
+                  } else {
+                    router.back();
+                  }
                   useAppStore.getState().removeCurrentWallet();
                 },
               },
diff --git a/yarn.lock b/yarn.lock
index 0244912..c26a46d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1604,6 +1604,19 @@
   dependencies:
     "@radix-ui/react-compose-refs" "1.1.0"
 
+"@radix-ui/react-switch@^1.0.3":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@radix-ui/react-switch/-/react-switch-1.1.0.tgz#fcf8e778500f1d60d4b2bec2fc3fad77a7c118e3"
+  integrity sha512-OBzy5WAj641k0AOSpKQtreDMe+isX0MQJ1IVyF03ucdF3DunOnROVrjWs8zsXUxC3zfZ6JL9HFVCUlMghz9dJw==
+  dependencies:
+    "@radix-ui/primitive" "1.1.0"
+    "@radix-ui/react-compose-refs" "1.1.0"
+    "@radix-ui/react-context" "1.1.0"
+    "@radix-ui/react-primitive" "2.0.0"
+    "@radix-ui/react-use-controllable-state" "1.1.0"
+    "@radix-ui/react-use-previous" "1.1.0"
+    "@radix-ui/react-use-size" "1.1.0"
+
 "@radix-ui/react-use-callback-ref@1.1.0":
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/@radix-ui/react-use-callback-ref/-/react-use-callback-ref-1.1.0.tgz#bce938ca413675bc937944b0d01ef6f4a6dc5bf1"
@@ -1628,6 +1641,18 @@
   resolved "https://registry.yarnpkg.com/@radix-ui/react-use-layout-effect/-/react-use-layout-effect-1.1.0.tgz#3c2c8ce04827b26a39e442ff4888d9212268bd27"
   integrity sha512-+FPE0rOdziWSrH9athwI1R0HDVbWlEhd+FR+aSDk4uWGmSJ9Z54sdZVDQPZAinJhJXwfT+qnj969mCsT2gfm5w==
 
+"@radix-ui/react-use-previous@1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@radix-ui/react-use-previous/-/react-use-previous-1.1.0.tgz#d4dd37b05520f1d996a384eb469320c2ada8377c"
+  integrity sha512-Z/e78qg2YFnnXcW88A4JmTtm4ADckLno6F7OXotmkQfeuCVaKuYzqAATPhVzl3delXE7CxIV8shofPn3jPc5Og==
+
+"@radix-ui/react-use-size@1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@radix-ui/react-use-size/-/react-use-size-1.1.0.tgz#b4dba7fbd3882ee09e8d2a44a3eed3a7e555246b"
+  integrity sha512-XW3/vWuIXHa+2Uwcc2ABSfcCledmXhhQPlGbfcRXbiUQI5Icjcg19BGCZVKKInYbvUCut/ufbbLLPFC5cbb1hw==
+  dependencies:
+    "@radix-ui/react-use-layout-effect" "1.1.0"
+
 "@react-native-async-storage/async-storage@1.23.1":
   version "1.23.1"
   resolved "https://registry.yarnpkg.com/@react-native-async-storage/async-storage/-/async-storage-1.23.1.tgz#cad3cd4fab7dacfe9838dce6ecb352f79150c883"
@@ -2127,6 +2152,15 @@
   resolved "https://registry.yarnpkg.com/@rn-primitives/slot/-/slot-1.0.3.tgz#878b488dd7844703eb0b4dbc51c239e1bdb0ca11"
   integrity sha512-sSDYwD2upLQUOva2cmNfaJqZlN+o0E/wa8uXEDEIYj6MJsG/O0k1t0jGXMqLP8BsQ3ZaTtUbqnG9eW/VQFOmdQ==
 
+"@rn-primitives/switch@^1.0.3":
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/@rn-primitives/switch/-/switch-1.0.3.tgz#8e26b4223226ec9aa125b4e875b0f99eaaf82c51"
+  integrity sha512-bzgRcdBw8myXeHerGxZw1bhhP7afqkj0N0nzcWmK0o9Epr70b++X1LkIFe0//BGsTkrulb02aJEkVg6UOgez3g==
+  dependencies:
+    "@radix-ui/react-switch" "^1.0.3"
+    "@rn-primitives/slot" "1.0.3"
+    "@rn-primitives/types" "1.0.3"
+
 "@rn-primitives/types@1.0.3":
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/@rn-primitives/types/-/types-1.0.3.tgz#1d0b084663859a889e5b7359eb2afe62ff311adb"
@@ -3845,6 +3879,13 @@ expo-linking@~6.3.1:
     expo-constants "~16.0.0"
     invariant "^2.2.4"
 
+expo-local-authentication@~14.0.1:
+  version "14.0.1"
+  resolved "https://registry.yarnpkg.com/expo-local-authentication/-/expo-local-authentication-14.0.1.tgz#0cad7f419d4694e1c205f589cdf355f2f2b3a2b4"
+  integrity sha512-kAwUD1wEqj1fhwQgIHlP4H/JV9AcX+NO3BJwhPM2HuCFS0kgx2wvcHisnKBSTRyl8u5Jt4odzMyQkDJystwUTg==
+  dependencies:
+    invariant "^2.2.4"
+
 expo-modules-autolinking@1.11.2:
   version "1.11.2"
   resolved "https://registry.yarnpkg.com/expo-modules-autolinking/-/expo-modules-autolinking-1.11.2.tgz#98245eb66f157bbfebebd2d576256ea7c683c605"
@@ -6577,10 +6618,10 @@ react-native-url-polyfill@^2.0.0:
   dependencies:
     whatwg-url-without-unicode "8.0.0-3"
 
-react-native-webview-crypto@^0.0.25:
-  version "0.0.25"
-  resolved "https://registry.yarnpkg.com/react-native-webview-crypto/-/react-native-webview-crypto-0.0.25.tgz#c35506e1f092f7633db684f388f2b449667a05a2"
-  integrity sha512-H1kn5FFk0tBq5JDpkopyonAQTFEDAGoVJG+9Ip84jx4QmHmh5hxaJ5PkOXsMeNb2wHnwuvsg5p3krCOYNf20+A==
+react-native-webview-crypto@^0.0.26:
+  version "0.0.26"
+  resolved "https://registry.yarnpkg.com/react-native-webview-crypto/-/react-native-webview-crypto-0.0.26.tgz#bce360876ed3367e677cb5cfa88564ca892ba72f"
+  integrity sha512-RshjQDik60LOhh7Q+SKIsXjnCgCIBZqZOB+v4MWa7l+0uAEyeZyMkWKL0xJRzWfTQ9vnLu4nHyn6qjEEi0uHnA==
   dependencies:
     encode-utf8 "^1.0.2"
     fast-base64-encode "^1.0.0"