How Cell phones Work?
Wednesday, May 7th, 2008A cell phone is nothing but a radio, but very high-tech. It is
basically like a CB radio or walkie-talkie. But CB radio or
walkie-talkie is a simplex system, where at a time a person can
talk or listen. But a cell phone is a duplex device, where a
person can listen and talk at the same time. One […]