TextBelt is an API for mobile texting. It works with particular US-based providers.
TextBelt can be used for simple texting apps; web applications from which texting mobile phones would be appropriate; or for doing testing on your own, without a cost.
The following U.S. operators are supported: Alltel, Ameritech, AT&T Wireless, Boost, CellularOne, Cingular, Sprint PCS, Telus Mobility, T-Mobile, Metro PCS, Nextel, O2, Orange, Qwest, Rogers Wireless, US Cellular, Verizon, Virgin Mobile.
It is used with a simple POST request.