These people give you the illusion that your expenses are capped by forcing you to pay them ahead of time ("recharge your balance"), but then keep billing you long after your balance reaches zero, without notifying you. You can come in 2 years later and find that you have a >$300 "debt" to them, which is exactly what happened to me.
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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.