Sending SMS messages

We may be creating an app that requires the user to send an SMS message to a specific number.

How to do it...

To send an SMS message, we make use of the SmsManager instance:

1. Before we can work with the SmsManager instance, we require a permission:

   [assembly: UsesPermission(Manifest.Permission.SendSms)]

2. To send the SMS, we only require a single method—SendTextMessage:

   var number = "0123456789";
   var message = "SMS Message Text...";
   var manager = SmsManager.Default;
   manager.SendTextMessage(number, null, message, null, null);

If we need to verify that the message was sent successfully, we can use intents that will be broadcast with the operation status:

1. First, we have to send the message providing the intents that will be broadcast when the message is sent and delivered:

   var sentIntent = PendingIntent.GetBroadcast(
     this, 0, new Intent("xamarincookbook.Send"), 0);
   var deliveredIntent = PendingIntent.GetBroadcast(
     this, 0, new Intent("xamarincookbook.Delivered"), 0);
   manager.SendTextMessage...