You have to press the house, menu, and end key at the same time ...wait until a triangle shows up on the screen then it will give you the options , this resets everything so save contacts, picture and other things youd like to keep
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Hard reset or Factory reset will restore the phone back to its factory settings; the way it was when it was first bought or the way it was when it left the factory. Note that this will erased the entire phone's memory (NOT memory card) and settings to the way it was when it was first bought.
How to hard reset or factory reset T-Mobile G1 phone:
Switch off your G1. *If it won't your phone won't switch off, take out the battery and reinsert it after a few seconds.
Now press the 'Power' key and 'Home' key at the same time and hold it for 20-25 seconds.
Then you will see on your screen a yellow triangle with an exclamation mark in the middle.
After that, press 'Alt+L' key on the QWERTY keyboard (to clean the phone completely).
Next, press 'Alt+W' key (to factory reset it)
Again, press and hold 'Power' key and 'Back' key at the same time for 20-25 seconds.
Have you tried a reset using the hardware buttons? To perform this, you need to turn off the phone first. While it is off, press and hold the home key and the power key at the same time. Keep holding the buttons until you see a screen with a triangle and an exclamation point in the middle. Once you see the triangle, let go of the buttons and open the keyboard. Press ALT+W at the same time, and the phone should reset.
Hi there. Factory reset will delete everything (not in all cases though) back all your numbers up to the sim card, back photo's and games up to the memory card (if you have one) and restore the phone to factory. As for any messages forget them.