Up until last friday, my prevail has had great signal. I've only had it for about two weeks. Than the following sunday, I went to my friends house (i was there friday too) and had no service at all in his house. Now i noticed even in my own house the signal is barely there. A friend of mine has a prevail and comparing it today (outside btw), i noticed when he had four bars i only had two/one. My phone was rooted right off the bat and today i unrooted to see if that were the problem. It isn't. What could it be?