Your mobile device converts voice and data messages into radio waves, which are part of the electromagnetic wave spectrum. The radio waves are transmitted as electrical signals through a network of base stations. Each base station has a cabinet and antennas to send and receive your communication. The antennas are usually fixed to a support structure such as a mast. Base stations relay your signal through cables, or a microwave connection, to a core switching centre, from where it is routed to its destination using the same technology.