I just got my first iPhone. It is an older model, the 3GS but it is brand-new and only cost $50. My problem is that I receive calls and messages in the middle-of-the-night and I am awakened every night. I know that there must be a way to completely disengage the phone so as not to be disturbed. Also, it went off in a movie theatre yesterday although the phone was shut-down. I got dirty looks and almost got ejected. What should I do? Thanks.