I have an iphone 4 on att and my signal is horrible inside my home and I've been just dealing with it. I had someone on speakerphone and noticed my signal went from 1 bar to 3 bars. I decided to got to the known dead areas in my house and my signal was still good. I got off speakerphone and boom signal was back at one bar. Anyone here know if there's anything I can do to get the same signal without being on speakerphone?