ZTE SFR 101 (also known as the ZTE 231 or SAGEM MY231X) is a legacy feature phone from the late 2000s that was heavily locked to the SFR network in France. Because of its age, the tools used to generate its "Network Control Key" (NCK) often rely on public algorithms that convert the device's unique IMEI number into an 8-digit unlock code. Unlocking Logic & Algorithms
Tech-savvy users can sometimes bypass network locks by flashing a generic ZTE stock ROM (not SFR-branded). This removes the lock entirely. zte sfr 101 unlock code calculator full
If successful, the phone will display a message like "Network Unlock Successful". Alternative Methods for Locked Devices ZTE SFR 101 (also known as the ZTE
How it works: You provide your IMEI number and pay a small fee. This removes the lock entirely
Whether the ZTE SFR 101 falls into this category is uncertain. The model number “SFR 101” suggests it is a carrier-branded variant of a ZTE reference design, likely from the 2010s. If it uses an older, compromised algorithm, a calculator might theoretically work. However, modern ZTE devices (and even mid-2010s smartphones) typically employ stronger, carrier-specific algorithms that have not been publicly cracked. Most so-called “calculators” found online are either:
Popular Unlock Code Calculators for ZTE SFR 101