Is it possible to send SMS over Wifi in Android App? : I'm working on an Android application in Android Studio and wanted to add a feature that allowed a text (SMS) message to be sent from the application to a mobile phone number. 

I found one way to do this by using the SMS Manager API, but it seems like this only works if the application is run on a cell phone with a SIM Card/Data plan. I'd like the user to be able to send a text over WiFi in case they're running the application on a tablet with only WiFi or another device that only has access to a WiFi connection. The application would only send messages to a mobile number, and doesn't need to worry about receiving texts back from said mobile number.

My initial research proves that it is not possible to send SMS messages over WiFi. My question is, is this actually the case? Or does anyone know of a way to do this over a WiFi connection? Even if I don't use SMS, I'd like some other way to get a message from the device to a mobile phone number. I just figured that SMS would be the most straight forward.

Thanks for your time!