Yesterday I upgraded my I Phone 3g to the OS 4. I discovered something that deeply disturbed me. I am a new I Phone user, so I wasn't aware that when I take a picture from my I Phone and send it to someone, that they can pin point exactly where I took that picture. So if I take a picture in my house and send it to someone, they now know where I live!!!!!! Even if I click, don't allow location, it doesn't matter, the location still shows up on the other persons phone! Maybe everyone is ok with this, but I am not and I want people to know this is happening! So in order for you to stop this from happening, you have to turn off the locations in the settings and also go to "restrictions" put in a password and turn off the locations. Then you have to make sure not to send any picture that you took before you have done this, because those pictures are still tagged! I hope this info is useful for someone!