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Turn on your carrier's SIM-change lock

Blocks changes that move your number to a new SIM or eSIM, so someone cannot take over your number with a SIM of their own. At Verizon it is called SIM Protection; at AT&T it is part of Wireless Account Lock, which also blocks number transfers.

Run by
AT&T / Verizon
Time
about 5 min
Where
United States
Verizon's page (opens in a new tab)AT&T's page (opens in a new tab)Mark it done in my breach check

How to do it

  1. Verizon: sign in to My Verizon with Account Owner or Manager access, go to Account › Account settings › Security settings, and turn on SIM Protection for your numbers. It blocks SIM swaps, upgrades and bring-your-own-device activations.
  2. AT&T: turn on Wireless Account Lock in the AT&T app; it blocks SIM and eSIM swaps, upgrades and IMEI changes.
  3. Other carriers: ask whether they offer a lock on SIM changes.
  4. When you get a new phone or SIM yourself, turn the protection off first. At Verizon, SIM changes stay blocked for 15 minutes after you turn it off.

What it does

Moving your phone number to another SIM
makes it harder

SourceVerizon (opens in a new tab)checked October 16, 2026