Another issue in samsung galaxy mobile phones is the strong security offered by pattern lock. pattern locks once set and put to ON mode, just give you few chances to get it right and unlock the mobile, and if unfortunately anybody forgets the pattern lock, what to do?
few guyz report to hard reset the mobile but that wont work. to hard reset you need to be on screen. so there should be some other way. yes there is! always a geeky way to achieve!
if you forgot your pattern lock, just give few more tries to continue wrong efforts. at an instant, the OS will report 'attempts exceeded, enter with your gmail'. at this point just enter your email address and in the textbox for password just give value as 'NULL'. this will instantly ask for new pattern lock and you are done!
hope it helps!