diff --git a/urns/urns.go b/urns/urns.go
index 1025bd1..64d4dc8 100644
--- a/urns/urns.go
+++ b/urns/urns.go
@@ -78,7 +78,7 @@ func IsValidScheme(scheme string) bool {
 }
 
 var nonTelCharsRegex = regexp.MustCompile(`[^0-9a-z]`)
-var telRegex = regexp.MustCompile(`^\+?[a-zA-Z0-9]{3,16}$`)
+var telRegex = regexp.MustCompile(`^\+?[a-zA-Z0-9]{3,64}$`)
 var twitterHandleRegex = regexp.MustCompile(`^[a-zA-Z0-9_]{1,15}$`)
 var emailRegex = regexp.MustCompile(`^[^\s@]+@[^\s@]+$`)
 var viberRegex = regexp.MustCompile(`^[a-zA-Z0-9_=/+]{1,24}$`)
diff --git a/urns/urns_test.go b/urns/urns_test.go
index 4c89fb9..0d3a303 100644
--- a/urns/urns_test.go
+++ b/urns/urns_test.go
@@ -207,11 +207,11 @@ func TestValidate(t *testing.T) {
 		{"tel:+250123", ""},
 		{"tel:1337", ""},
 		{"tel:PRIZES", ""},
+		{"tel:cellbroadcastchannel50", ""},
 
 		// invalid tel numbers
-		{"tel:07883 83383", "invalid tel number"},       // can't have spaces
-		{"tel:12", "invalid tel number"},                // too short
-		{"tel:12345678901234567", "invalid tel number"}, // too long
+		{"tel:07883 83383", "invalid tel number"}, // can't have spaces
+		{"tel:12", "invalid tel number"},          // too short
 
 		// twitter handles
 		{"twitter:jimmyjo", ""},
@@ -302,7 +302,7 @@ func TestTelURNs(t *testing.T) {
 		{"PRIZES", "RW", "tel:prizes", false},
 		{"PRIZES!", "RW", "tel:prizes", false},
 		{"1", "RW", "", true},
-		{"123456789012345678901234567890", "RW", "", true},
+		{"123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890", "RW", "", true},
 	}
 
 	for _, tc := range testCases {