We have been using their SMS-sending service for three years now. It has always been very reliable, (not even one shortage in these three years). The API is very good and easy to use, the SDKs the same thing, with a wide range of them, and everything very well documented.Might not be the cheapest solution, but when your business depends on a service like this, 100% worth it.I'd recommend it and I would use it again in my future ventures and personal projects
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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.