Power off the router and insert a SIM card from a different network provider.
You enter the code into the router’s web interface. zte router unlock tool
Switch between providers like AT&T, T-Mobile, Vodafone, or local prepaid SIMs when traveling. Power off the router and insert a SIM
Use a ZTE unlock tool or service to get your NCK code. zte router unlock tool
If your current provider has a dead zone in your area, you can switch to a carrier with better tower coverage.
Some routers require "debranding." This involves overwriting the carrier-customized software with a generic ZTE "Global" firmware.