I work in a friggin bomb shelter and get no service at my desk, but when I walk outside, I can get service. problem is it takes some time to find 3g service when I walk outside. I want to be able to quickly check my stuff during my brief walks outside but end up getting to my destination before 3g kicks in. is there a 3g refresh button. What about airplane mode, turn on, the turn off quickly.... would that serve my purpose?