How to Check iPhone Network Lock & SIM Lock Status
A "great deal" iPhone is often a locked one. Knowing the network lock (also called SIM lock or carrier lock) status tells you whether the phone works on any network or only one — and that changes both its value and usefulness.
Network lock, SIM lock, carrier lock
These terms describe the same restriction: the iPhone will only accept a SIM from its original carrier and shows "SIM not supported" with any other. A factory-unlocked iPhone works on any compatible network worldwide.
Why the lock status matters
- Locked phones are worth noticeably less and harder to resell.
- You cannot use a local SIM when traveling abroad.
- Unlocking may require the original owner or a carrier fee.
How to verify the lock status
- iPhone Network Lock Check — lock and activation status combined.
- iPhone Carrier Check — the original carrier the phone was sold on.
- iPhone Carrier & SIM-Lock Check — original carrier plus SIM-lock details.
Verify it yourself: never trust a screenshot. Run a Full IMEI Check on the actual IMEI the seller gives you — the result cannot be faked.
Bottom line
Confirm the lock status with a live lookup before you buy. An unlocked iPhone is the only safe choice for resale and travel — verify it with the Full IMEI Check.
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