Taken from the internet: “No, they cannot. Signal boosters are designed to prevent this from happening. The devices only work in the confined space where they’re installed. If your neighbour wants to benefit from your boosted cell signal, she’ll have to come over to your house.”   Utter nonsense. Operator signal is available to everyone who has a sim card that can connect to them. A cellular signal booster is a device that amplifies cellular signal indiscriminately. A correctly installed signal booster presents coverage which can extend to a few meters outside a home or office. A worker can be standing outside your door calling a friend in Canada. If you are living in a town house in SA this is very possible. Your neighbour can install a second signal booster and piggyback via your booster to the BTS (base station). There will be no costs to you but a convenience to your neighbour. Please do not get misled. The network signal you have amplified does not belong to you. You are a subscriber to a licenced network provider. Your sim card will tell you who that is.