So, for the past week, my iPhone 3G has been randomly dropping its signal completely, as in the bars are gone and the 3G icon disappears. This makes it impossible to do any phone-related functions. It lasts for about a minute, then it reacquires the signal. I have no idea how often it happens, it just seems to happen about 5-6 times every hour. Like I said, this has been happening for the past week. I called AT&T and they said that service is fine out in my area, and there are no repairs going on or anything that would cause my phone to lose signal. What's going on? Is it my phone that's messing up?