Battery usage can also be a major concern, as running a mobile repeater for both your cellphone signal and a connection to the G networks will use much more power then just one or the other. The amount of power that the booster amplifies your signal by will vary as well, typically measured in wattage. All of these basic, important factors must be taken into account when you are thinking about buying a mobile phone signal booster. It will definitely be worth your time and money to sit down and think about how and when you will use your new booster, and how powerful your booster may need to be. Otherwise, you could end up stuck with an expensive piece of equipment that doesn't serve your needs at all.