"Thank you. I tried your code already, but it doesn't work. iOS 15.4 seems never allow USSD number for security reason or something. eskimo + "1" + "@apple.com" says 'The Apple URL Scheme Reference describes this limitation and the reasons for it.' https://developer.apple.com/forums/thread/14766 — user21 1 week ago "
That thread was from 6 years ago. This was fixed in iOS11 and worked until iOS15.4.