Here is how you do a hard reset or factory reset of the T-Mobile G1.
- Power off the G1
- Hold Home Key + End key for 20 seconds or till you see a triangle with an exclamation point and a picture of the G1
- Open the QWERTY keyboard and hit Alt+W
You will see a little animation and it will reset on it’s own from that point.

December 23rd, 2009 on 1:54 am
thanks for this trick
i use this trick on my T MOBILE G1 phone its 100% working
March 24th, 2010 on 12:31 pm
i need info on resetting tmobile samsung t239,can you help?
April 19th, 2010 on 1:31 am
thx so much for the technique, now i can use my phone normally ,i’m really happy!!, but i need to start everything start from 0…
^^