Nokia E71x phones branded with the AT&T logo may be locked to AT&T, which means that they cannot be used with SIM cards from other wireless providers. To use a locked E71x with another carrier's wireless service, you will need to deactivate the network lock by entering an unlock code that can be obtained from AT&T.
Instructions
1. Dial "*#06#" on your E71X's keypad to display your phone's IMEI, or International Mobile Equipment Identity, number.
2. Call AT&T's customer service line and request the unlock code for your E71X. Each E71X has a unique unlock code, and you will need to provide your IMEI number to obtain the correct code.
3. Push the door release buttons on the left and right sides of your E71x and pull the battery door off the phone.
4. Grab the edge of the battery closest to the camera and lift the battery out of the phone. Slide the SIM card out of its slot, and then replace the battery and the battery door.
5. Press the "Power" key on the top of your E71x to turn it on.
6. Type "#pw+CODE+1#" using your phone's keyboard, where "CODE" is the unlock code for your E71x.
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