Avoid Sending SMS to Landlines with the Lookup v2 API and Go
Blog post from Twilio
Twilio’s tutorial explains how Go developers can avoid sending SMS messages to landline numbers by using the Lookup v2 API’s Line Type Intelligence feature before sending messages. It outlines prerequisites including a Twilio account, an SMS-capable Twilio number, Go 1.23 or later, test mobile and landline numbers, and the Twilio Go helper library with GoDotEnv. The sample application loads Twilio credentials and sender details from a .env file, checks each supplied number through Lookup v2, yields only numbers identified as mobile, and sends SMS messages through Twilio’s Messaging API while reporting successes or failures in the terminal. Filtering non-mobile numbers in advance can reduce failed-message charges and improve the reliability of Go applications that use SMS communication.
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