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AT&T iPhone 12 Series Unlock — Remove SIM Lock by IMEI
Is your AT&T iPhone 12, 12 mini, 12 Pro or 12 Pro Max showing SIM Not Supported, SIM Not Valid or SIM Locked? Remove the AT&T carrier lock remotely and permanently. Use any 4G or 5G SIM or eSIM, anywhere in the world.
What This AT&T iPhone 12 Unlock Service Does
Many iPhone 12 models sold in the United States are carrier-locked to AT&T. This includes phones bought on an AT&T plan, refurbished “AT&T only” units, and phones sent as gifts from the USA. If you put in a SIM card from another network, iOS refuses it. The phone keeps working on Wi-Fi, but you can’t make calls or use mobile data.
Our service removes the AT&T carrier lock using the phone’s IMEI. After the unlock is processed, Apple’s activation record for your device changes from “SIM locked” to “No SIM restrictions”. Your iPhone 12 then works with any compatible carrier on 4G and, where your carrier supports it, 5G. The unlock is permanent and stays after iOS updates or a factory reset.
Supported AT&T iPhone 12 Models
| Model | US Model No. | Screen | 5G | Supported |
|---|---|---|---|---|
| iPhone 12 mini | A2176 | 5.4″ | Yes | Yes |
| iPhone 12 | A2172 | 6.1″ | Yes | Yes |
| iPhone 12 Pro | A2341 | 6.1″ | Yes | Yes |
| iPhone 12 Pro Max | A2342 | 6.7″ | Yes | Yes |
Every storage size (64GB to 512GB) and every colour is supported. To find your model number, open Settings > General > About and tap the model name once.
iPhone 12 SIM Problems Caused by the AT&T Lock
This is the most common message when a US AT&T phone gets a local SIM in Bangladesh, India, Nigeria, Ghana, the UAE or Europe.
The SIM is detected, but the iPhone 12 won’t register on the network or shows “No Service” or “SOS”.
Settings > General > About > Carrier Lock confirms that the iPhone 12 is still tied to AT&T.
A new carrier’s eSIM QR code won’t install and iOS tells you to contact your carrier to unlock the device.
Why Unlock Your iPhone 12 with ASUnlocker
- 100% remote — the IMEI is all we need. Your phone stays with you.
- Permanent official-style unlock — the status changes on Apple’s server, not through a temporary software trick.
- Keeps 5G and eSIM working — unlike R-SIM or Turbo SIM adapters, which often break calls, data or iOS updates.
- Safe for iOS updates — update to the latest iOS without the lock coming back.
- Higher resale value — an unlocked iPhone 12 usually sells faster than an AT&T-only unit.
- Live order tracking and support — check your order status in your account, or message us on WhatsApp or Telegram.
- Made for GSM shops — bulk IMEI submission and DHRU Fusion API access for resellers.
What You Need Before Ordering
- An iPhone 12 mini, iPhone 12, iPhone 12 Pro or iPhone 12 Pro Max that is locked to AT&T USA.
- The 15-digit IMEI. Dial *#06# or open Settings > General > About. Use IMEI 1, not the eSIM IMEI 2.
- A clean IMEI that has not been reported lost or stolen.
- No iCloud Activation Lock. The phone must be set up, or able to be set up, with the owner’s Apple ID.
- Ownership of the device, or the owner’s permission to unlock it.
How to Unlock an AT&T iPhone 12 by IMEI
Dial *#06# and copy the first IMEI.
Add funds, select “AT&T USA iPhone 12 Series” and submit the IMEI.
We notify you as soon as the unlock is completed.
Connect to Wi-Fi and insert the new SIM, or add an eSIM. Restart the phone if prompted.
Unlock Done but Still “SIM Not Supported”?
Sometimes the new status takes a few minutes to sync. Turn the phone off and on again with Wi-Fi connected. If the message is still there, back up the phone and restore it with iTunes (Windows) or Finder (Mac), then set it up again with the new SIM inside.
Video: Add Funds to Your ASUnlocker Account
AT&T iPhone 12 Unlock — FAQ
How do I unlock my AT&T iPhone 12 Pro Max from outside the USA?
Send us the IMEI and place an order. The unlock is processed remotely, so it doesn’t matter which country the phone is in. Once it is complete, insert your local SIM and the phone will connect.
Will 5G work after unlocking my iPhone 12?
Yes. The iPhone 12 series has 5G hardware. After the unlock, 5G works on any carrier that supports 5G for iPhone in your area.
My iPhone 12 was a gift from the USA. Can it be unlocked?
In most cases, yes, as long as the IMEI is clean and the phone isn’t iCloud locked. Send us the IMEI first and we will confirm whether it is supported.
Is the unlock permanent after an iOS update?
Yes. The unlock is saved on Apple’s activation server, so iOS updates, restores and factory resets won’t lock the phone again.
Can a blacklisted or iCloud-locked iPhone 12 be unlocked?
No. Lost or stolen devices cannot be carrier-unlocked, and this service does not bypass iCloud Activation Lock.
Is this better than an R-SIM or Turbo SIM?
Yes. A SIM adapter is a workaround that can stop working after an iOS update and often breaks 5G, eSIM or iMessage. An IMEI factory unlock removes the lock itself, permanently.
Do you unlock AT&T iPhone 11 too?
Yes. See our AT&T USA iPhone 11 Series SIM Unlock service for iPhone 11, 11 Pro and 11 Pro Max.
Unlock Other AT&T USA iPhone Models
Have a different AT&T-locked iPhone? Choose your series below. Each page lists the supported models, requirements and SIM/eSIM details for that generation.
AT&T iPhone 12 Series Unlock
iPhone 12 mini, 12, 12 Pro, 12 Pro Max
Free IMEI Check Before You Pay
Send your iPhone 12 IMEI and we will confirm whether it is supported.
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