# SIM Hijacking Another common attack facing individual holders is **SIM hijacking**. In this attack, the attacker convinces the phone company to port the target’s phone number over to another phone (or they pay off someone inside the phone company to do it). Since many websites use SMS to recover accounts when the password is lost, an attacker with control of the target’s phone may be able to access some of their accounts. **Mitigation:** * Never use SMS for account recovery. * Avoid SMS for 2FA. Use hardware tokens or OTP instead. * Use a sovereign key storage system where no third parties have the ability to spend your coins. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.casa.io/wealth-security-protocol/threat-overview/sim-hijacking.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.