I'm sure many of you had this scenario before, you are at work, you put your phone your desk. and your friends/coworkers come over to chat, and casually pick up your phone to play around. If you don't put a unlock pattern, your gmail, sms, facebook, is completely exposed to their eyes. I've had times where coworkers picked up my phone and pulled up porn search histories on my browser, etc. In this case, should I just grab the phone back immediately from their hands whenever someone is trying to play with it, but doing this is just telling people "i have something to hide" If you put a lock pattern, people will say "oooohhh! What do you have to hide?!", and that's even worse. Nowadays, everytime I go to work or go out with friends , I always clear out my histories from every app. But I'm afraid I'll forget once and my social reputation will be ruined.