In order to collect a profit from your cell towers there need to be residential buildings in the area it is built in. After you have registered the residents in the same area as the cell tower you can collect the profits from that cell tower. To increase the amount of income you receive from a cell tower, you need to increase the amount of residents using it. Build more residential houses and register more residents in the area where the tower is located. Upgrade your cell towers to increase the amount of money you get per subscriber, and to allow them to store more coins at a time.

Having a developed mobile network is very profitable!

Have fun playing the game!