Due to a vehicle’s steel structure, it has a strong wireless signal shielding that hampers cellular signal penetration. When the vehicle is travelling through suburban or rural areas where the signal coverage from the BTS (Network base station) is poor, and the subscriber needs to make a call or send text, they will need to stop where signal outside the vehicle is adequate to do so. A car signal booster enhances the UL (outdoor) connectivity, which combined with a (ALC) automatic line control where the signal is poor and will reduce its gain to where the signal is adequate. When areas where cellular signal is substantial, the car signal booster is switched off as it is not required.