Major security flaw found in AT&T’s upcoming Samsung Galaxy S II device. All you have to do is wake the device using the lock key, then let the screen time out, then wake it again with the key and you can access all the data. The Sprint version or other does not suffer from this security flaw. Even I just check my own Samsung Galaxy (Indian) Version, Yeah – ITS SAFE 🙂 Video Demonstration shows how easy it is to access all data on the device.
Source: https://thehackernews.com/2011/09/samsung-galaxy-s-ii-at-trusted-pattern.html