NerdsInn.Messaging (nuget): This will let developers to send and receive sms from their android phones to there .net application. This is especially build for .net window form applications. For more details check out the documentation page http://docs.nerdsinn.com/app/messaging You have to only install one app in your android mobile from play store https://play.google.com/store/apps/details?id=com.nerdsinn.dotnetsms. C# window form example project is: https://github.com/shahkhalid-me/dotnet-messaging 
Keywords: SMS|Android|GSM|textmessaging