Unlock a Samsung Phone — IMEI Checks, Carrier Unlocks and Codes

Samsung handsets are locked by the carrier that sold them or by a code derived from the IMEI. This page lists the 90 models our device register recognises, explains how Samsung locks a handset, and links the checks and unlocks that apply to it.

How Samsung devices are locked

Samsung devices can be locked two different ways. Older and mid-range models prompt for an NCK / MCK code that is derived from the IMEI and typed on the keypad. Flagships from roughly 2020, and all US carrier variants, are locked server-side like an iPhone and have to be released by the carrier instead.

The practical consequence is the same for every family: the phone works, and it refuses to activate on a SIM from another network until the record against the IMEI changes. Wi-Fi keeps working, so the device looks healthy right up to the moment the new SIM goes in.

Samsung models in the register

Samsung services

What to check first

Guides that apply to Samsung

Model names and TAC counts come from the GSMA TAC register we query for /tac. Last updated 2026-10-28.