: Use any local or international nano-SIM card to find the best data plans.

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

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

Unlocking typically follows two main paths: using an unlock code or flashing a new firmware version. 1. Unlocking via IMEI Code (Recommended)

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

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

: 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.