United States · AT&T
How to unlock Samsung on AT&T (United States) - NCK / MCK codes
AT&T locks Samsung devices until the contract is settled. This service removes that lock by NCK / MCK / SIM unlock code, delivered automatically for service #310.
Carrier at a glance
- Country
- United States
- Carrier
- AT&T
- Device family
- Samsung
- Unlock method
- NCK / MCK / SIM unlock code
- Typical turnaround
- 1-15 Minutes
- Service number
- #310
How the unlock works
A device bought on AT&T in United States stays tied to that carrier until the contract or instalment plan is settled. The carrier holds the lock in their database; once the record is cleared, the phone accepts any SIM.
This service clears the lock server-side using NCK / MCK / SIM unlock code. Nothing is flashed, nothing is opened, and the device keeps its warranty. You only need the IMEI.
- Confirm the Samsung is locked to AT&T (any carrier check service).
- Order service #310 and submit the IMEI.
- Wait for delivery — usually 1-15 Minutes.
- Enter the NCK code when the phone asks for a network unlock code (MCK clears the second lock level).
Need help with a specific model?
Eligibility rules differ per model and per account status. If your device is rejected or you are unsure which service fits, message our team before ordering — we check the IMEI against the carrier rules and tell you which option will work.