my reception bounces around a lot i dont know why. it goes from 1 bar to 3 bar when im sitting in the same spot. the call quality is pretty good though even on a 2 bar, but the bars going up and down so often just use up battery. its pretty fast from what ive seen but in my opinion itll be a tie with the htc one and a tad bit faster then the s4, but only noticeable if you do side by side.