Cho Cha

Is AT&T to Blame for 3G's Performance in the iPhone?

I tried the # Ted Landry suggested and it works, I just don't know what it means. @ 1st I had a reading of 113 in my office which usually gets very poor reception on 3g, I leaned back in my chair and it dropped to a negative 87. If someone could explain what these #'s mean I would appreciate it.