Mobile phones transmit and receive signals using electromagnetic waves, that is, wireless signal are electromagnetic waves which can travel through a vacuum, they do not need a medium or matter.
They are generated by electrical and magnetic particles moving at the same time (oscillating).
Therefore, we can conclude that electromagnetic waves are those that do not need a material medium to propagate and include, among others, radio, television and telephone waves.
Learn more about electromagnetic waves here: https://brainly.com/question/13803241