It seems that EVO has the same bug as other HTC phones with the unlock screen pattern. If you set the unlock pattern and have it locked you may have to reboot the phone. I had to do this last night because even though I was using the proper gmail and password it wouldn't unlock the phone. The Sprint rep could do nothing to help. Make sure to back up the phone prior to setting up an kind of unlock pattern. After the reset I tried to recreate the problem but now works but only after losing everything on the phone.