ZTE SFR 101 (often identified as a variant of the ZTE S302 or similar low-end feature phones) is a device typically locked to the SFR network in France. Unlocking it allows the use of SIM cards from other carriers. unlock code calculator
If you have obtained a code via a calculator or a service, here is the procedure to apply it: zte sfr 101 unlock code calculator full
Older ZTE feature phones rely on specific algorithm-based locking mechanisms. ZTE SFR 101 (often identified as a variant