The SIM card has important information stored on it, such as your unique identifier that connects you to a specific network, your phone number, and an authentication key unique to your SIM card.

[Jason Gin] wanted to reuse the SIM card that came with a ZTE WF721 wireless terminal he got from AT&T, but as he expected, it was locked to the device. Unfortunately, the terminal has no function ...

Begin by ensuring that the SIM card is correctly inserted into the device. Power Off the Device: Turn off your Samsung Galaxy before handling the SIM card. Eject the SIM Tray: Use the SIM ejector tool ...