It was very easy to implement with our application. Only complaint is the send speed of the SMS if you don't have a shortcode. A send rate of 1 per second is a bit slow when you have thousands of messages to send. But other than that the service is great.
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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.