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Comment on How to make USSD call on iOS 15.4 beta
The tel URL scheme doesn't take slashes actually. Try tel:0123456. Or let iOS figure it out for you:         var comps = URLComponents()         comps.scheme = "tel"         comps.path = "0123456"         guard let url = comps.url else {             assertionFailure(); return         }         UIApplication.shared.open(url, options: [:]) { success in             if !success {                 NSLog("*** Open URL (url.absoluteString) failed")             }         }
Apr ’22