Verizon Number Lock vs AT&T Port Protection: Which is Better for Preventing SIM Swap?
Verizon swap/carrier-number-lock-port-freeze/">Number Lock and AT&T Port Protection both serve the same purpose - preventing unauthorized SIM swaps and port outs - but Verizon’s version is currently more robust. Neither is perfect, and both require you to actively enable them, but Verizon’s system adds an extra layer of verification that AT&T’s does not.
How each feature works
Verizon Number Lock is a free account-level setting that, when turned on, prevents any port-out request, SIM change, or device transfer from being processed without a separate, out-of-band verification step. Once activated, any attempt to move your number to another carrier or swap your SIM will be blocked until you specifically approve it - usually via a text message to your current phone or through the My Verizon app.
AT&T Port Protection is also free and available to all wireless customers. When enabled, it blocks port-out requests to other carriers. However, it does not block SIM swaps within AT&T’s own network. That means an attacker who gets your AT&T account credentials could still move your service to a new SIM on AT&T, then use that phone to intercept SMS two-factor codes and attempt a port out.
Key Differences
| Feature | Verizon Number Lock | AT&T Port Protection |
|---|---|---|
| Blocks port-outs to other carriers | Yes | Yes |
| Blocks SIM swaps within same carrier | Yes | No |
| Requires separate verification for changes | Yes | No |
| Available on all consumer accounts | Yes | Yes |
The critical point is that SIM swap fraud often happens in two stages. First, the attacker gets your number onto a SIM they control (either through a carrier store visit, social engineering of a support agent, or by exploiting a leaked password). Second, they use that number to reset passwords on your financial accounts. AT&T Port Protection only blocks the second step. Verizon Number Lock blocks both.
Practical Security Considerations
What happens if you lose your phone? Verizon Number Lock’s extra verification can be a double-edged sword. If you lose your phone and need to get a new SIM activated quickly, you must first disable Number Lock. That requires you to either log into your account (which you may not be able to do without your phone) or contact Verizon support and verify your identity. AT&T’s system, being simpler, lets you authorize a SIM swap more easily - but that same simplicity is what attackers exploit.
How to enable each:
- Verizon: Log into your My Verizon account, go to Account > Security > Number Lock, and toggle it on. You will be prompted to confirm via text or app notification.
- AT&T: Log into your AT&T account, go to Profile > Wireless > Manage Port Protection, and toggle it on. No additional verification is required at setup.
Which one should you use?
Use both if you have accounts on both carriers, but in practice, Verizon Number Lock provides stronger protection for the same effort. If you are on AT&T, Port Protection is still worth enabling, but you need additional layers:
- A strong, unique password on your AT&T account, plus two-factor authentication that does not rely on SMS.
- A SIM PIN on your phone itself (not a carrier lock, but a device-level PIN that prevents anyone from using your SIM in another phone without entering it).
- Consider using an authenticator app or hardware security key for your most sensitive accounts, especially cryptocurrency exchanges and email providers.
Limitations and Gaps
Neither feature protects against every form of SIM swap. Both can be bypassed by a determined attacker who has enough of your personal information - name, address, Social Security number, date of birth - to convince a carrier store employee to issue a new SIM without checking for the lock. Verizon has faced instances where store employees overrode Number Lock by escalating to a manager. AT&T’s simpler system is more vulnerable to such bypasses.
Additionally, both features only work if you are aware of them and have them turned on. Many customers never enable either, and carriers do not make them mandatory. The industry is moving toward stronger protections, but as of 2026, you must take the initiative.
Bottom Line
Verizon Number Lock is the stronger tool because it covers both port-outs and internal SIM changes. AT&T Port Protection is better than nothing but leaves a significant gap. Regardless of which carrier you use, do not treat these features as a complete solution. Combine them with a SIM PIN, a dedicated email for financial accounts, and hardware-based two-factor authentication where possible. The safest account is the one that cannot be taken over through your phone number alone.
Not financial advice. rosiesol.xyz publishes market data and general information about Rosie. Crypto assets are volatile and you can lose everything you put in. Nothing here is a recommendation to buy, sell or hold, and we make no price predictions.
Prices are sourced from third parties and may be delayed or wrong. Verify anything you intend to act on against a primary source.