iPhone Unlock
How to Unlock an AT&T iPhone (IMEI Carrier Unlock Service)
AT&T iPhones stay locked to AT&T until the line is paid off and active for 60 days. Here is how to read the AT&T lock status of an iPhone, which AT&T policy your device falls under, and which IMEI unlock service matches it.
Last reviewed 2026-10-26
US carrier iPhones are the largest source of locked devices in the resale market, and AT&T is the largest of them. An AT&T iPhone that shows “SIM Not Supported”, “No SIM restrictions” missing from Settings, or refuses a non-AT&T SIM is still tied to AT&T’s activation policy database.
An AT&T carrier unlock is not a jailbreak and does not touch iOS. It flips the device’s activation policy on Apple’s server from “AT&T locked” to “accept all SIMs”. Once that flip has happened, the device stays unlocked after a factory reset and after iOS updates.
What AT&T requires for a free unlock
AT&T publishes its own unlock policy, and most failed DIY unlock attempts come from a policy mismatch rather than a technical failure. Before you submit an IMEI to any unlock service, confirm which bucket the device falls into.
- The device is paid off (no remaining installment balance).
- The line has been active for at least 60 days.
- The IMEI is not reported lost or stolen, and the line is not flagged for fraud.
- A device reported as “past due” is still locked — AT&T will not release it until the balance is cleared.
Important
An iPhone reported blacklisted or lost/stolen cannot be unlocked by any legitimate service. Buying a cheap “blacklist unlock” for a stolen device usually means losing your money and keeping a brick.Check the AT&T lock status first
Never buy an unlock service on the assumption that a device is locked. Run an Apple SIM lock / carrier check on the IMEI first — it returns the current activation policy and the carrier the device is locked to, which is also the only way to discover that a device you were told was “unlocked” is actually still tied to AT&T.
The same report tells you whether the IMEI has an open GSMA blacklist entry or an iCloud activation lock, both of which block an unlock or make it pointless.
Which AT&T unlock service to order
AT&T cases differ a lot in difficulty, and the catalog reflects that. Match the case, not the price:
- Standard, paid-off device: pick the lowest-tier AT&T unlock service; these go through the normal eligibility channel.
- Past-due / unpaid balance device: these need the AT&T past-due unlock services, which are priced by success risk and by generation (iPhone 4–14, iPhone 15/16, iPhone 17 and generic).
- Device with an unpaid balance or on a semi-premium tier: use the semi-premium service — a normal service will simply return “not eligible”.
- Device already unlocked but recorded as AT&T: verify with a model + lock check before paying for an unlock.
How the unlock is delivered
- 1Submit the 15-digit IMEI on the service page (no cable, no software, no remote session).
- 2We push the IMEI to the AT&T unlock channel and wait for the activation-policy update.
- 3When the order completes, restore the iPhone (or insert a non-AT&T SIM) and the setup flow no longer asks for an AT&T SIM.
- 4Confirm the result in Settings → General → About → Carrier Lock should read “No SIM restrictions”.
Tip
Turn the iPhone off and back on after the unlock completes. iOS caches the SIM policy, and a restart is what forces it to re-read the new activation policy.Services used in this guide
These are the exact catalogue entries this guide refers to. Prices and turnaround are live.
Open the catalogueFrequently asked questions
Frequently asked questions
Will an AT&T unlock delete my data?
No. The unlock only changes the carrier policy on Apple’s servers. Before the policy propagates you may see a “Carrier Settings Update” prompt — accept it, but do not erase the device unless you want a factory reset.
Does an AT&T iPhone unlock survive updates and resets?
Yes. A carrier unlock is permanent for that IMEI and is re-applied by iOS during setup, so updating to a new iOS version or erasing the phone does not restore the lock.
Can I unlock an AT&T iPhone that still has an installment balance?
That is the past-due / semi-premium case. Choose an AT&T past-due or semi-premium unlock service for the device generation — the standard service will reject it.
How do I know the phone is really locked to AT&T?
Run an Apple SIM lock check on the IMEI. It returns the carrier the device is locked to, plus model, colour and storage, which also confirms the phone is what the seller claimed.
Related guides
US T-Mobile / Metro / Sprint
T-Mobile & Metro by T-Mobile iPhone Unlock
T-Mobile, Metro by T-Mobile, Sprint and Boost Mobile devices share one activation-policy family. Here is how to check the lock, which sub-brand policy applies, and how to unlock by IMEI — including blacklisted devices.
US Verizon
Verizon iPhone Unlock (Already Unlocked vs. Locked)
Most 2020-and-later Verizon iPhones ship 60-day unlocked — so a Verizon model that refuses a foreign SIM usually has a different problem. Here is how to tell the two cases apart before paying for an unlock.
SIM lock status
Check iPhone SIM Lock Status by IMEI
A five-minute procedure to find out which carrier an iPhone is locked to, before you buy an unlock service — or before you buy the phone at all.