How to Check If a Used iPhone Is Carrier Unlocked
A carrier-unlocked iPhone can be activated with a compatible plan from a different mobile provider. That flexibility is useful when buying a used phone, changing providers, or adding a travel eSIM. The quickest check is built into iOS, but it helps to understand what the result does and does not confirm.
Check Carrier Lock in Settings
- Unlock the iPhone and open Settings.
- Tap General, then About.
- Scroll to Carrier Lock and read the entry beside it.
If the entry says No SIM restrictions, Apple identifies the iPhone as unlocked. If it names a carrier or indicates a restriction, do not assume another provider's SIM or eSIM will work. Apple's carrier-unlocking instructions use the same Settings check.
You need access to the Home Screen to perform this check. A photo of the box, a model number, or the presence of a SIM tray is not a substitute for looking at the phone's current Carrier Lock entry. If a seller is demonstrating the phone remotely, ask for a recent photo or video of Settings > General > About and confirm that it corresponds to the device being sold.
What “No SIM restrictions” means
The message indicates that the iPhone is not restricted to one carrier. It applies whether the device uses a physical SIM, eSIM, or both. It does not, by itself, confirm that your plan is active, that every network feature is supported, or that the phone is ready for a new owner's Apple Account. Those are separate checks.
Before buying, confirm the exact iPhone model and how you plan to activate it. SIM hardware and eSIM availability vary by model and region. If you intend to use two carriers at once, Apple's Dual SIM guide says the iPhone must be unlocked to use different carriers. Check the intended provider's requirements for the model and plan, especially if the device was originally sold in another country.
How to test a physical SIM or eSIM
The Settings entry is the primary lock-status check. An activation test adds confidence that the phone works with the service you plan to use. If the model has a physical SIM tray and you have an active SIM from your intended provider, insert it with the seller's permission. Give the phone time to connect, then try a call and mobile data. If the phone displays Invalid SIM or No SIM, the cause may be a lock, an inactive plan, a SIM problem, or a device issue. Apple recommends checking the plan, carrier settings, and SIM before drawing a conclusion.
For eSIM, ask the carrier whether the exact model can be activated on your plan. Avoid transferring your primary number to a seller's phone simply for a quick inspection unless you are ready to complete the purchase. An unlocked status does not automatically provision an eSIM; the provider must still activate the plan. Apple's Invalid SIM troubleshooting guide and cellular setup guide describe these separate steps.
If the iPhone is locked to a carrier
Ask the seller which carrier holds the lock and whether that carrier has confirmed an unlock. Apple says only the current carrier can unlock an iPhone for use with another provider; Apple cannot remove a carrier lock. The carrier may need time to process the request. Wait until the phone shows No SIM restrictions before treating an unlock promise as complete.
If the carrier confirms the unlock but the phone still reports a restriction, follow the carrier's instructions and Apple's guidance rather than buying an unofficial unlocking service. Depending on the situation, Apple describes activating with another SIM or, when no alternate SIM is available, backing up, erasing, and restoring the phone. Do not erase a seller's data yourself without permission. A buyer should be able to verify the final status on the device before relying on it.
Carrier Lock is not Activation Lock
The two names sound similar, but they protect different things. Carrier Lock limits which mobile provider can activate the phone. Activation Lock links the device to an owner's Apple Account through Find My. A carrier-unlocked iPhone can still be Activation Locked and unusable by a new owner.
Apple advises against buying a preowned iPhone if it displays iPhone Locked to Owner. If the device is at the Hello setup screen, complete setup far enough to confirm it can be activated and used. If you are inspecting it in person, ask the seller to remove their account and erase the phone before you finalize the transaction. See Apple's preowned iPhone inspection guide for the recommended checks.
Check the rest of the phone before buying
An unlocked phone is not necessarily a phone in good condition. Check its display, cameras, speakers, microphones, buttons, charging connection, battery health, and listed storage. Apple's preowned-device guide provides a practical inspection sequence. Where available, Parts and Service History under Settings > General > About can also show information about repairs. A replacement part does not automatically make a device unsuitable, but it is useful context for the price and expected condition.
It is worth checking the seller's return terms before an online purchase. After delivery, compare the device with the listing, check the Carrier Lock entry again, and test your intended SIM or eSIM promptly. Keep a record of the stated unlock status in case the received phone differs from the description. Our guide to 80% battery health on a used iPhone covers another common condition question.
Compare unlocked used iPhones
When comparing devices, check each listing's model, capacity, condition, and stated carrier status rather than assuming all examples of one model are identical. Browse our used iPhone collection to see current options, then confirm the details for the individual phone you choose.
Compare iPhone 13 and iPhone 14 options
If you are narrowing the choice to nearby generations, our iPhone 13 and iPhone 14 identification guide explains how to distinguish them. You can then compare the used iPhone 13 listings and used iPhone 14 listings, including the storage and condition available at the time. Verify the Carrier Lock status of the specific device before completing a purchase.
Quick checklist
- Open Settings > General > About and look for No SIM restrictions.
- Confirm that your intended provider supports the model and SIM or eSIM arrangement.
- If possible, test an active plan for calls and mobile data.
- Make sure the phone is not Activation Locked to someone else's Apple Account.
- Inspect battery health, hardware condition, storage, repair history, and return terms.
For most buyers, the About screen provides a clear first answer. Treat any unresolved lock as a question for the seller and the original carrier, not as a detail to sort out after purchase. Once the carrier status is confirmed, complete the separate activation and condition checks before choosing a used iPhone.