B311-221 Unlock Firmware [patched]

When traveling abroad, insert a local prepaid SIM card instead of paying expensive international roaming rates.

This is the safest method as it does not involve risky software modifications and remains permanent even after firmware updates. B311-221 Unlock Firmware

after reboot.

While traveling, you can insert a local SIM card and avoid high roaming fees. When traveling abroad, insert a local prepaid SIM