3. Press 123456789*0# within 60 seconds after the Headset, Mute, and Speaker buttons begin to flash. If you repeat a key within the sequence, for example, if you press 1223456789*0#, the sequence is still accepted and the phone resets.

If you do not complete this key sequence or do not press any keys, after 60 seconds, the Headset, Mute, and Speaker buttons no longer flash, and the phone continues with its normal startup process. The phone does not reset. If you enter an invalid key sequence, the buttons no longer flash, and the phone continues with its normal startup process.

If you enter this key sequence correctly, the phone displays this prompt: Keep network cfg? 1 = yes 2 = no

In order to reset the network configuration settings when the phone resets, press 2.