i'm thinking of switching to att and picking up an iphone4 and i have a few questions for anyone that owns one and has a few minutes to spare. the antenna issue. i know a guy in my area that owns one and heard a lot of bad things from him about dropped calls. he let me check his out and i was able to cause a serious signal drop by touching the spot where you can bridge the antennas. granted, i live in a poor signal area and his phone had no case. anyone here live in an area with a weak signal been able to get around the problem with a case? reliably? how about the light sensor? everything i'm reading about it is conflicting. is the problem that it doesn't work at all for some people or is it just a lot more sensitive than on older phones? how severe is the increase in data usage? i had an iphone 3g, so i guess am i'm asking in comparison to that. thanks in advance for your time.