Manufacturers and network carriers eventually realized that these simple algorithms made it too easy to bypass network locks. Modern devices, including the ZTE SFR 101, use much more complex encryption methods.
These services have direct access to ZTE’s or SFR’s official database. They are not using a “calculator”; they query the real server. zte sfr 101 unlock code calculator full
Unlocked phones are worth more on the second-hand market because they are compatible with all networks. Conclusion including the ZTE SFR 101
Unlocking the ZTE SFR 101: A Guide to Unlock Code Calculators zte sfr 101 unlock code calculator full