Build a carrier block list with Twilio Lookup

Twilio's Verify API can be vulnerable to sophisticated attacks, such as artificially inflated SMS traffic from bad actors. To mitigate this risk, developers can use Twilio's Lookup API to build a carrier block list that filters out known bad carriers before sending an SMS verification. This involves identifying mobile country codes (MCC) and mobile network codes (MNC) combinations that are globally unique and used to identify carriers worldwide. By using the Lookup API, developers can create a custom block list of MCC-MNCs to prevent suspicious traffic from reaching their Verify API. While blocking entire carriers carries risks, alternative methods like detecting riskier numbers or using reCAPTCHAs can provide additional security measures.

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