Their support is not good, I've test their messaging for a year with bad support and weird responses until it's working with test. Now when I upgrate it says stripe error, when I need it right away no messsaging in production use. I sent out critical support ticket and called tehm, no immediate response.
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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.