How to send SMS at scale with Twilio

Twilio is a messaging service that allows developers to send SMS and other communication services. To send a single SMS, one needs a Twilio account, a phone number to send from, the destination phone number, and the message content. However, as scaling up increases, challenges such as carrier rate limits, customer preferences, anti-spam measures, monitoring, and re-delivering messages become significant issues. Messaging Services can help address these challenges by providing pools of phone numbers that can be used in place of a "from" number when sending SMS messages. Notify Services allow developers to send messages to multiple recipients in one API call, which is convenient but requires careful coordination and error handling. Short codes can also be used for high-volume SMS sending, offering pre-approved throughput by carriers and reduced carrier filtering. By using Messaging Services and Notify Services, developers can scale up their SMS messaging without significant challenges.

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