We have an ATT Microcell in our basement and we get great coverage throughout the house. Without it I can't make phone calls in the rear of the home. I tried Wifi Calling but it really was not as reliable as the Microcell.My house is in a weird spot. The only carrier that I've tested here that gets at least 2 bars is Verizon. Go out onto my driveway and the signal jumps to 4-5.
The only issue with the Microcell is it can be a pain to get it up and running again after even a split second power outage.
A friend of mine told me the Microcells are bad for your health and wants me to place it in the attic.