In the amid of all bad reviews I see here. I am going to describe my experience as a Developer working with their services (API). Their support for developers is professional. Twilio APIs and documentation are some of the best in the industry. They have several SDKs and are maintained regularly which makes creating applications and integration with Twilio much easier. Big SHOUT out to the engineering team!
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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.