I have a Samsung Gravity phone serviced by T mobile. In my house, I get bars, so I have service. But next to the service icon on the phone I frequently get a slash and the word "searching" this means that I have no signal. It just started doing this a couple days ago and only seems to do it in particular rooms of the house. Does anybody have any idea what to do? I tried the basic take out the battery/sim card/ restarting it several times. Also, as far as I know, it hasn't received any water or physical damage.