Add a PIN to your phone account to stop SIM swaps
Added
Scammers who learn enough about you can talk your carrier into moving your number to their phone, then use your texted security codes to get into bank and social accounts. Ask your carrier to add a PIN or password to your account, turn on email and text alerts for important accounts, and keep identity details off social media.
The result
Result: FCC: losing service, with the phone going dark or only allowing 911 calls, is typically the first sign of a SIM swap or port-out scam; if it happens, contact your phone company and bank and file a police report.
Source
FCC: SIM Swap Tip Card (opens the original source in a new tab). Check it for the latest numbers before you act.