I tested this while driving on a stretch of road that I usually get one bar of service. It went up to four.  I'm very happy with this purchase. I contacted weboost customer support to learn how this worked and get a good expectation prior to buying. If you get zero bars, you are not going to get bars with this. It can't create cell service. It boosts existing service. I also bought the home conversion kit from weboost. I had to go from room to room and various windows and went from 1-2 bars to 4. I have a Sprint personal and Verizon business. Once I got four bars that is where I left it. This does get hot so if you keep this plugged in all the time I would worry. In the car I mounted it near a vent and at home i open a window or put a small fan on it. I can now stream and work flawlessly. Take your phone out of its case for best contact and fit (and air flow to phone).