1 SMS per second and the only way to increase this is to lease additional lines! Twilio is cheap hotchpotch of retail cellular accounts wired together then marketed as an enterprise service.
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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.