I Put The Wrong Pattern To Open My Cellphone

• enter wrong code 5-10 times and wait about 30 seconds
•  a prompt will come up asking you to sign into your gmail account  (this needs to be same account you used to activate/setup phone with)

if you cannot remember or all else fails do a factory reset (you will lose settings and apps but data on memory card will remain ) : 

• HOLD power button and shut down the phone.
• Hold HOME and RED POWER down for 25 seconds until you see a triangle with an exclamation mark in it. Keep holding it down even though the G1 logo shows up
• Now you can do 2 things : 

                 Home+Back reboot system now – (Soft Reboot) 

                 Alt+W – Wipe data/factory reset – (Out of Box reset need to re-register.)

*Factory Reset is LAST RESORT :) . DO Soft Reboot First .