Culture File 4:
There are three main systems of cell phone (U.K. — mobile phone) in the world. To use a phone in all countries you need a ‘tri-band’ phone.
Cell phones took longer to become widely popular in the U.S.A. and for a long time were more expensive than in Europe or Asia. In most of the world, you pay to make cell phone calls. In the U.S.A., you usually pay to receive and make cell phone calls.