Cell telephone and Mobile phone

Mobile phone and cell telephone are semantically related In some cases you can replace phrase "Mobile phone" with "Cell telephone", this phrases are similar.

Mobile phone noun - A hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver.

Cell telephone and mobile phone are semantically related in cellular telephone topic. You can use "Cell telephone" instead a noun phrase "Mobile phone".