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:

: Check the sticker on the bottom of the router or go to the admin panel (typically http://192.168.8.1) under Device Information .

: Place a SIM card from a different network into the mini-SIM slot .

: Avoid high roaming charges by using local SIMs when traveling abroad.

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

: 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

: Some custom or "global" firmware versions may unlock advanced settings like manual band selection (e.g., choosing specifically between LTE Band 1, 3, 7, 8, 20, or 38). How to Unlock the Huawei B311-221

: Unlocked routers are significantly more valuable on the second-hand market.

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