Ok right now i'm with T-Mobile using a Factory Unlocked 5S. Most places I go the signal is very low, This only the case with my 5S. I have an old 4G Android Phone that gets better signal. Example: 5S:1/0 Bars in my room. Android Phone:4/5 Bars in the same room. Is something wrong with my 5S? I don't understand how a 3 year old Android Device gets better service. And this is the case anywhere I go. I already switched sim cards in case that was the problem but still no improvement. I also have the same issue with ATT.