Google Fi Wireless has a new Number Lock feature that provides an “additional layer of protection against illegal SIM swaps.”
“SIM swapping happens when someone is able to steal your phone number by convincing your carrier to port your phone number over to a SIM card they own. For example, someone may call your carrier, pretend to be you, and convince your carrier that you have lost your phone and need to move your number to a new phone.” Google.
When Number Lock is enabled, “you can’t transfer your number to a new device or carrier while this lock is active.”
To enable, go to the Google Fi website (fi.google.com/account) and select your user (if you have multiple as part of a group plan). Go to Phone settings > Privacy & security > Number lock.
Tap “Sign in to manage Number lock” and confirm your Google Account credentials to enable the toggle.
If you ever want to “transfer your number to a…
Source 9to5google.com