What are some alternatives?
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
World Brush - AR app where you paint on the real world for others to find
Twilio - Brings voice and messaging to your web and mobile applications.
TapTag - Leave photos for other people to find
Bandwidth - Track your Wi-Fi hotspot usage. Zero configuration required. It just works.
Run an Empire - Turn runs into adventures