I am using Twilio with a phone-tree app. This allows Sprint cell customers to read the text messages. Before, Sprint cell customers would only receive empty text screens. Another benefit is AT&T cell customers see the "from" text number, where before they received only an incrementing 10 digit number; AT&T was seeing the text as an email, and sending as an email.
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We take care of the messy telecom hardware and expose a globally available cloud API that developers can interact with to build intelligent and complex communications systems. As your app's usage scales up or down, Twilio automatically scales with you. You only pay for what you use - no contracts, no shenanigans.