: Some Android apps, such as SIM Network Unlock for ZTE , offer free unlocking for specific carriers (like AT&T) if the device is out of contract. Steps to Unlock Your ZTE Router

A ZTE router network unlock code is a unique 16-digit code that unlocks your router from its current network provider. This code allows you to use your router with any SIM card from any network provider, giving you the freedom to choose the best network for your needs.

: Power off your ZTE router and insert a SIM card from a different network provider.

His ZTE router—a sturdy, black box with a single blinking red light—was locked. Not with a password, but with a "Network Unlock Code: 16 digits required." A ghostly message that had appeared after his cheap data plan expired. The router, a hand-me-down from a friend who’d traveled overseas, now refused to speak to any local SIM card.

Sixteen digits.

Obtain a SIM card from a network different from the one your router is currently locked to. Access the Admin Panel: Insert the new SIM card and power on the router.