Because sometimes, stringing wires is a huge pain.
It's estimated that 85% or more of people have a need for a cell booster somewhere in their day. Yet, there are plenty of reasons that you personally might not be able to install even the simplest one. Maybe you're in an apartment and can't run a wire to the roof. Maybe you just aren't healthy enough to climb a ladder. Maybe, you just don't want to. (I won't judge.) The good news is that there's an answer for you folks who can't wire up a cell booster: the Cel-Fi boosters from Nextivity
Cel-Fi boosters are different from any other booster on the market because both antennas are designed to be indoors, and require absolutely no drilling or wiring. They communicate wirelessly.