Protect Your Phone Number
Your number is an identity key. Treat it that way.
Add a PIN to your mobile account
Ask your carrier about an account passcode.
Never share one-time codes
No genuine organisation will ask for a code.
Use an authenticator app
Reduce reliance on text-message codes.
Watch for loss of service
Unexpected no-service can signal a number transfer.
Limit where you share your number
Share it only where it is genuinely needed.