How to Unlock an AT&T iPhone in 2026 (Step-by-Step + Eligibility)

An AT&T-locked iPhone only accepts AT&T SIM cards. Pop in a T-Mobile, Verizon, or international SIM and you get a "SIM Not Supported" message. The good news: if the phone is paid off and the account is in good standing, AT&T unlocks it for free. This guide walks through the official method and what to do when you don’t qualify — for example, a used iPhone you bought second-hand.

Step 1 — Check if it is already unlocked

Before doing anything, confirm the current status. On the iPhone: open Settings → General → About and scroll to Carrier Lock. If it says No SIM restrictions, the phone is already unlocked — you are done. If it names AT&T, it is still locked. Dial *#06# to pull up the 15-digit IMEI; you will need it for the unlock request.

Step 2 — AT&T’s 2026 eligibility rules

AT&T will reject your request unless all of these are true:

• Device age: purchased more than 60 days ago.
• Paid in full: installment balance is zero (promotional bill credits don’t count).
• Not reported: not lost, stolen, or flagged for fraud.
• Account standing: no past-due bills.
• Ownership: not active on another AT&T account.

Prepaid AT&T phones follow a longer timeline (roughly 12 months of paid service). You do not need to be an AT&T customer to request an unlock, as long as the device itself qualifies.

Step 3 — Submit the official unlock request

Go to AT&T’s device unlock portal (att.com/deviceunlock), enter the IMEI, and submit. Most modern iPhones unlock automatically in Apple’s database — no code or SIM swap needed. You’ll get a confirmation email, and the Carrier Lock line in Settings changes to No SIM restrictions within 24–48 hours. For older devices, AT&T emails step-by-step instructions.

What if AT&T rejects you (or you bought it used)?

Common blocks: the phone is still financed, was reported by a previous owner, or the 60-day window hasn’t started. If you bought a second-hand iPhone and the original account is closed or unknown, the carrier portal won’t help. That is where a third-party IMEI unlock service comes in: it submits the unlock through wholesale channels using only your IMEI and email. Our AT&T iPhone unlock covers clean, eligible devices and most edge cases for a flat fee.

Check blacklist and iCloud before you unlock

An unlock does not clear a blacklisted IMEI or an iCloud Activation Lock. Run a full IMEI check first, and read our explainer on carrier lock vs. Activation Lock so you know exactly what you are buying. If you are still shopping, start with our how to check if a phone is unlocked guide.