Signal strength depends on what carrier and were you are. For myself I work in NYC at Grand Central Terminal. I have VZW, where my office is I am jumping between 1x and 4G. I am surrounded by concrete and steel. When I am at home I get 2-3 bars of that good 4G service.
When I first started at my Job AT&T was great then it sucked, then Verizon was better, Now Verzion is so So and AT&T is better, It goes back and forth.
I am going to stay with VZW because I have my UDP.
I got the G3 the end of last month I came from the HTC one M7. So far so good
Chris