It's called 'cellular' because the system uses many base stations to divide a service area into multiple 'cells'.Cellular calls are transferred from base station to base station as a user travels from cell to cell. Since cellular phones are extremely popular throughout the entire would so the market is unlimited. People of all age groups often have a cell phone.
Teenagers have it to keep in contact with their parents and friends.
Business people have it so the will never miss an important call from a client or business partner. Cell phones are also used for safety reasons. Many people have it with them while they are traveling in case of emergencies. Ericsson is the world's leading supplier in telecommunications with the largest customer base, including the world's top 10 operators. Ericsson provides total solutions covering everything from systems and applications to mobile phones and other communications tools.