I have tried everything you said and it is still not working. I can't even connect to my own cumputer's wifi. My service was just cut off the day before I reset my phone because it would freeze up all the time and the Genius button stopped working. My phone has always been set on Wifi preferred and I have not changed anything on it. I don't know why it won't let me sign back into my gmail account (an account that i already had before i got my mytouch q) like when i first signed into my phone new phone. It has not even been a year yet since i had the phone.
T-Mobile. America's First Nationwide 4G Network