> For the complete documentation index, see [llms.txt](https://epochsec.gitbook.io/daily-activities-best-practices/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://epochsec.gitbook.io/daily-activities-best-practices/staying-safe-in-crypto/enable-sim-lock.md).

# Enable SIM Lock

Lock your phone SIM

* 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.