It consists of three components that work together:

1. An outdoor antenna mounted on the roof or side of your home. This antenna is powerful enough to pull in even weak cell signals that may not be detected by your smartphone.

2. A booster unit plugged in inside the house. The booster receives the signal from your outdoor antenna and amplifies it into a dependable signal that can be used by devices indoors.

3. An antenna installed inside your home. This antenna takes the boosted cellular signal and distributes it throughout the house to provide more uniform connectivity.

Pro:

With a strong, reliable signal throughout your entire home, you don’t need to change locations or go outside to improve your coverage. Phonetone cell signal boosters work with all U.S. carriers including Verizon, Sprint, AT&T, and T-Mobile, so all household members and guests benefit from a quality signal no matter what plan they have. 

Con: 

It’s not free. However, Phonetone signal boosters are a one-time purchase. There are no subscription fees or monthly payments and the boosters are compatible with future 5G networks.