There are number of companies selling cell phone antenna signal booster to improve cellphone reception and call clarity by boosting the signal reception of the phone. There are however complaints against cell phone signal booster stickers and you will find mixed reviews about its boosting capacity.
To install an external cell phone signal booster:

Locate a window where you get signal.
Mount the Signal Antenna outside of the window.
Place the Base Unit across the room (15 feet away) where you want to …