Cellular phone transmission sites are points where cellular telephone signals are relayed between the sender and receiver. They are usually located atop towers or structures of medium height - normally not as high as radio and television transmission towers.

The site forms part of the mobile telephone signal path. An area where people can use phones is not a transmission site merely because reception is available.

Towers and existing structures can both carry the equipment. Their usual moderate height is descriptive rather than a required height range.