When sending an SMS from iPad, the country code of the recipient is automatically changed.

Hello.

My development environment is as follows.

iPhone 7 - Ver iOS14.5.1

iPad 8th- Ver iPadOS14.5.1

Microsoft Visual Studio Enterprise 2019 - Ver 16.9.5

Xamarin - Ver 16.9.000.292

Xamarin.iOS and Xamarin.Mac.SDK - Ver 14.16.0.5

https://support.apple.com/en-us/HT208386

Using the above article as a reference, I linked my iPhone and iPad with an Apple ID and sent SMS from an iPad application created with Xamarin, but the country code I specified as the recipient was automatically changed to a different number than the one I wanted.

The source code is as follows.

ISMS.cs

    class CSMSiOS : ISMS 
    {
        public void SendSMS(string Dial,string WideDial)
        {
            if(!MFMessageComposeViewController.CanSendText) //SMS function available
            {
                Console.WriteLine("SMS function not available");
                return;
            }
            
            MFMessageComposeViewController smsController = new MFMessageComposeViewController();

            if (!string.IsNullOrWhiteSpace(Dial))
            {
                string[] recipients = Dial.Split(';');
                if (recipients.Length > 0)
                    smsController.Recipients = recipients;
            }

            smsController.Body = WideDial+ "Message";
            smsController.SetEditing(false, true);
            

            PresentMessageComposeViewController(smsController);

            Console.WriteLine("SMS sending page");
        }

        private void PresentMessageComposeViewController(MFMessageComposeViewController smsController)
        {
            EventHandler<MFMessageComposeResultEventArgs> handler = null;
            handler = (sender, args) =>
            {
                smsController.Finished -= handler;

                if (!(sender is UIViewController uiViewController))
                {
                    throw new ArgumentException("sender");
                }

                uiViewController.DismissViewController(true, () => { });
            };

            smsController.Finished += handler;
            ClsSMSPageView.PresentUsingRootViewController(smsController);
        }
    }

ClsSMSPageView.Xaml.cs

static class ClsSMSPageView
    {

        public static void PresentUsingRootViewController(this UIViewController controller)
        {
            if (controller == null)
                throw new ArgumentNullException(nameof(controller));

            var visibleViewController = GetVisibleViewController(null);
            if (visibleViewController == null)
            {
                throw new InvalidOperationException("Could not find a visible UIViewController on the Window hierarchy");
            }
            visibleViewController.PresentViewController(controller, true, () => { });
        }

        private static UIViewController GetVisibleViewController(UIViewController controller)
        {
            UIViewController viewController = null;
            UIWindow window = UIApplication.SharedApplication.KeyWindow;

            if (window == null)
                throw new InvalidOperationException("There's no current active window");

            if (window.WindowLevel == UIWindowLevel.Normal)
                viewController = window.RootViewController;

            if (viewController == null)
            {
                window = UIApplication.SharedApplication.Windows.OrderByDescending(w => w.WindowLevel)
                                      .FirstOrDefault(w => w.RootViewController != null && w.WindowLevel == UIWindowLevel.Normal);
                if (window == null)
                    throw new InvalidOperationException("Could not find current view controller");
                else
                    viewController = window.RootViewController;
            }

            while (viewController.PresentedViewController != null)
                viewController = viewController.PresentedViewController;

            return viewController;
        }
    }

For example, if you specify [8081234567], [+0] would normally be specified as the country code and it would be [+0 8081234567], but somehow [+44] would be specified as the country code and it would be [+44 8081234567].

I welcome any and all opinions and advice you may have. Thank you very much.