If I could put 0 I would.We were scammed with sms fraud to the tune of 2000USD. Eventually they refunded us. However 2 months later they canceled our account because of a bank charge back which we had cancelled. They basically threw our business under the bus. No one could sign up to our service for days. If you want to lose your clients and damage your business use twilio.
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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.