How to Check If Your iPhone Is Unlocked

A carrier-locked iPhone will not accept a SIM or an eSIM from any network except the one that sold it. The phone is otherwise perfectly capable — it is a software restriction, not a hardware limit — but from a traveller’s point of view the effect is the same: the plan you bought will not connect.

iOS will tell you outright, and it takes about ten seconds to ask. Do it before you buy a travel plan, not after — Apple puts the same check at the top of its troubleshooting for an invalid-SIM or no-SIM alert, ahead of anything to do with the card.

Open Settings → General → About and scroll to Carrier Lock. Apple documents this as the check, and there are only two answers that matter:

• "No SIM restrictions" — the phone is unlocked and will take any network’s SIM or eSIM.
• Anything naming a carrier — the phone is locked to that carrier.

This reads the phone’s actual state rather than guessing from where it was bought, which is why it beats every rule of thumb about contracts and countries.

The Carrier Lock line appears on iOS 14 and later; on anything older the field may be absent, and a second-hand phone can show a stale entry. In that case ask the carrier directly: give them the IMEI, which you get by dialling *#06#, and they can tell you the lock status of that specific handset.

Unlocking is the carrier’s job and generally free once the contract terms are met. Apple is explicit that it cannot do it for you — only the carrier that sold the phone can. It is also not something to attempt through an unofficial service; those either do nothing or put the warranty at risk.

1. 1Contact the carrier that sold the phone and ask for an unlock. Most have a form in their app or on their site.
2. 2Expect a condition: the device paid off, or a minimum time on the account. They will say which.
3. 3Wait — usually a day or two, occasionally longer. There is nothing to do on the phone while you wait.
4. 4When they confirm, re-check Settings → General → About. It should now read "No SIM restrictions".

Start this at least a week before travelling. It is the one step in preparing for a trip that depends entirely on somebody else’s timeline.

With a physical SIM, a lock announced itself at the moment you swapped cards. With an eSIM the profile downloads happily, appears in the list, looks installed — and then simply never registers on a network. The failure looks like a broken plan rather than a locked phone, which sends people to the provider instead of the carrier. Apple’s own troubleshooting for that case ends by telling you to contact the carrier rather than the seller of the plan.

It matters more every year, too, because more iPhones have nowhere else to put a line: Apple’s list of which SIM each iPhone uses now covers US models from the iPhone 14 onward and, with the iPhone 17 line and the iPhone Air, models bought in Canada, Mexico, Japan and several Gulf markets as well.

That is why the Carrier Lock line is worth reading before anything else, and why it is worth confirming the travel line actually registered once it is installed. Which phones support eSIM covers the other case where capable hardware still will not connect.

You can buy a travel plan and install it before you fly, keeping your home line for calls and texts. Compare on price per GB rather than headline price, by destination.