Avoid Sending SMS to Landlines in PHP with Twilio's Lookup v2 API
Blog post from Twilio
Twilio’s PHP tutorial explains how to avoid the cost of failed SMS messages by using the Lookup v2 API to identify and exclude landline and other non-mobile numbers before sending notifications. It outlines a PHP 8.4 project using Twilio’s PHP SDK, Monolog, and PHP Dotenv, with credentials and a sending number stored in a development `.env` file. The core implementation creates a reusable `FilterIterator` subclass that queries each number’s Line Type Intelligence data and retains only numbers classified as mobile, while the main script loops through accepted numbers, logs the action, and sends each one an SMS through Twilio’s Messaging API. The tutorial concludes by showing how to run the application and notes that this filtering approach can prevent charges associated with attempted delivery to unsupported phone lines.
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