Tons of problems with a confusing and badly documented API. Sales is incredibly helpful but once you are past the sales wall you will never receive any support. Customer support can take over a week before they handle your zendesk ticket. Most of the time request for updates go ignored. I wouldn't recommend this service to my worst enemy.
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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.