Apple updated its guidelines a while back so that if you want press a button in your App to then make a phone call, it must prompt first to ask the user for confirmation that they wish to make the call.After hours and hours of trying to make my own UIAlertController and really struggling with the Confirm button not running the function to actually make the call, I decided to do a lot more googling.Turns out there is a fantastically simple way to use the built-in prompt.if let url = NSURL(string: "telprompt://01234567890"){UIApplication.sharedApplication().openURL(url)}