How to Detect SIM Swaps in Rust With Twilio's Lookup API

SIM-sent one-time passwords can be compromised through SIM-swap attacks, in which a fraudster persuades a carrier to transfer a victim’s phone number to a SIM under the attacker’s control, enabling interception of calls and authentication messages. Twilio’s Lookup API provides carrier-sourced data on whether a number’s SIM has recently changed, helping applications assess potential account-compromise risk, though a swap alone is not proof of fraud because users may replace lost phones, upgrade devices, or change carriers. The tutorial demonstrates building a Rust command-line application with Cargo, dotenvy, rustlio, serde, and tokio; storing Twilio credentials in a .env file; and calling the Lookup v2 API with the SIM Swap data package to retrieve and display a number’s last SIM-swap date and relevant period information. It advises using this signal within a broader risk-assessment process rather than as an automatic fraud decision.

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