GSM Modem (SMS) android app designed for students who are working on projects and want free SMS sending and free SMS receiving functionality in their projects. GSM Modem (SMS) exposes set of APIs for two possible operations. 1. Sending SMS (from your project using JSON APIs). For Example:: http://192.168.1.102:8090/SendSMS?username=sadiq&password=12345&phone=0300xxxxxxx&message=Text-Message 2. Receiving SMS (in your project). For Example:: http://192.168.1.104/sindhitutorials.com/public/api/