SIM Network Unlock Explained: Locked vs Unlocked, How to Check, and the Official Routes

What does "locked to a network" mean?

Some phones are sold tied to a single carrier (for example, sold on a contract or installment plan). A locked phone rejects other carriers' SIM cards — insert a new SIM and it says "SIM not supported". That's not a fault; it's a deliberate software lock.

How to check your phone's status

• On iPhone: Settings → General → About — look for "Carrier Lock": "No SIM restrictions" means unlocked.
• By testing: try a SIM from another carrier — if it works, the phone is unlocked.
• By checking: a full IMEI check gives you the "SIM-Lock Status" in writing — the certain method before buying or traveling.

The official unlock routes

• Request from the original carrier: once the contract/financing is complete, the carrier usually must unlock it — free or for a small fee.
• IMEI unlock services: professional services submit the unlock request to the carrier/manufacturer database — the unlock is official and permanent, surviving updates and resets.
• Avoid temporary workarounds: interposer SIMs (turbo SIM) and temporary exploits break with the first update and leave the phone unstable.

How long, and how much?

Time and price depend on the carrier and model: some networks unlock in minutes, others take business days. See the live price and delivery time for any service in the services catalog before ordering — our price is written before payment, with a full refund if the unlock fails on the supplier side.

The bottom line

Learn the status by checking, unlock through the official route, and keep the result in writing. Your phone stays unlocked forever, with any SIM.