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Do you want to send SMS from your Windows Phone 8.1 App ? . You can use the ChatMessage class in Windows Runtime to do it.
Sending SMS from a Windows Phone 8.1 App
Here’s a code that demonstrates how to send SMS from a Windows Phone 8.1 App .
ChatMessage sms = new ChatMessage(); sms.Body = "Test SMS"; sms.Recipients.Add("11233"); await Windows.ApplicationModel.Chat.ChatMessageManager.ShowComposeSmsMessageAsync(sms);