don't require "://" in URL, only require ":" -> works for tel:12345 URLs

use ActionDial instead of ActionView for tel: URLs

src/keepass2android/EntryActivity.cs

@@ -1066,7 +1066,7 @@ namespace keepass2android
 			if (url == null) return false;
 
 			// Default http:// if no protocol specified
-			if (!url.Contains("://"))
+			if ((!url.Contains(":") || (url.StartsWith("www."))))
 			{
 				url = "http://" + url;
 			}

src/keepass2android/Utils/Util.cs

@@ -103,7 +103,9 @@ namespace keepass2android
 				else
 				{
 					Uri uri = Uri.Parse(url);
-					context.StartActivity(new Intent(Intent.ActionView, uri));
+					context.StartActivity(new Intent(
+						url.StartsWith("tel:") ? Intent.ActionDial : Intent.ActionView, 
+						uri));
 				}
 			}
 		}