: Place a SIM card from a different network into the mini-SIM slot .
If the router is heavily restricted, you may need to flash a "Global" or "General" firmware version. HUAWEI LTE Cat.4 WiFi Router (B311-221) - wifi-stock.com Huawei Router B311-221 Unlock Firmware
When a router is locked, it only recognizes SIM cards from the original carrier it was purchased from. Flashing or "unlocking" the firmware offers several benefits: : Place a SIM card from a different
: Unlocked routers are significantly more valuable on the second-hand market. Huawei Router B311-221 Unlock Firmware
: When the web interface prompts for a SIMLOCK Code , enter the unique code obtained from a trusted unlocking service or carrier. 2. Flashing "Unlock" Firmware
This is the safest method as it does not risk "bricking" the device.