Step-by-Step Guide To Unlock Your AT&T Phone. Unlocking your AT&T phone using network unlock codes is a straightforward process: Step 1: Access AT&T's official device unlock request page. Step 2: Click the Unlock Your Device option on the page. Step 3: Type in your mobile number associated with the AT&T device. From Fireware Web UI, select System Status > 4G LTE Modem or 5G Modem, then click Unlock SIM Card. From Fireware System Manager, select Tools > Unlock SIM Card, or from the Front Panel tab, right-click LTE Status in the Interfaces section for modem0, then select Unlock SIM Card. After you specify a correct PIN, the Firebox unlocks the SIM card .
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