# Enable SIM Lock * Sim locking * Feature that is most commonly overlooked. * Requires authentication for accessing a SIM. * An attack becoming more common is that a bad actor will attempt to socially engineer your service provider and convince them into sending the bad actor, a replacement SIM. This will in turn allow them to receive your calls, SMS, and any OTP / 2FA SMS authentication messages. * Android, for example, has the SIM locking feature in “settings”. You can enable this and set a pin for authentication to unlock the SIM. --- # 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://epochsec.gitbook.io/daily-activities-best-practices/staying-safe-in-crypto/enable-sim-lock.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.