Using a cellular signal booster is the most effective method to eliminate issues created by weak signals of cellular devices which already have a signal tower outside your home, office, or a huge commercial building. The application of these cellular signal boosters are unique and is based on the signal strength outside of the building, the organic and manmade surroundings, the number of users, and overall needs of the user.
How To Choose The Right Cellular Signal Booster?
For choosing the correct signal booster you need to know few information-
Carriers And Networks That You Need To Support
Cellular signal boosters can only amplify specific frequency of radio waves which pertain to specific carriers (Airtel, Vodafone, Verizon, Sprint, etc.) and networks on those carriers (2G, 3G, or 4G LTE). So you need to know both these info, as that determines which signal amplifier you will be able to use and which type of outside antenna you will need.
Outside Signal Strength
The signal strength outside the building helps you to determine how strong an amplifier you need to provide the needed coverage for the area you want to be covered. Weaker signals outside require a stronger signal booster so that the signal strength will be strong in the area.
A cellular signal booster depends on the area to be covered to a greater extent. The combination of outside signal strength and the size of the area to be covered will determine how strong of an amplifier you will need.
So, for choosing the right signal booster, you need to take all three points into consideration. Where you are also determines which cellular signal booster you should get.
In Europe, signal boosters are generally illegal because the cellphone operator has the rights to control transmission in the frequency. The alternative is a small cell / femtocell / picocell depending on whether you want it for home use (say 8 users), or for an enterprise which will have around 16 to 32 users. They are usually tied to operators and will only boost 3G or LTE signals. As 2G is vanishing now, using 2G femtocells is not very productive.
In the US, they can be illegal if they do not automatically control their uplink signalling power (otherwise this can cause interference to the cell phones of other users whom the operator cannot control, thus degrading their service).