History of Mobile Phones
The Electromagnet was invented in 1825 by William Sturgeon, a British electrician. This was followed by the invention of the electric telegraph by Samuel Morse that transmit electrical signal over wires and is translated to message. The Telephone, a device that could transmit speech electrically was invented by Alexander Graham Bell in 1876.
Radio technology began as wireless telegraphy in 1866 by Mahlon Loomis, an American dentist. The Radio, a two way communication device developed from the permanent installations in vehicles to bag phones and the backpacked walkie talkie developed by Motorola in 1940s to hand held two way Handie talkie (HT) It was the size of a man’s telephone and Radio technologies combined to bring Radio Telephone.Radio telephone appeared in Europe in1926.
Soon, it was realized that when mobile phones are connected to smaller and lower powered base stations arranged in cellular pattern and with frequency reuse there is an increase in the number of people who can talk at a time i.e an increase in the traffic was how the cellular phone started in 1947. The electronics of cell phones was developed by Richard H. Frenkiel and Joel S. Enjel of Bell lab in the 1960s.
Most phones were analog in the 1980s. They are mostly digital now with ease of signaling,lower level of interference and increased capacity.
GSM (Mobile System for Mobile communication)
Lack of standardization for the various systems developed resulted in compatibility problems especially with the development of Radio technology. To address this problems, GSM, a standardization group was established in 1982 to create a common European mobile telephone standard that would formulate specifications for a pan European mobile cellular Radio system. It was hoped then that other countries would join the partnership.
1G (First generation) These were analog, used for voice calls only.
2G (Second generation):These were digital, provided caller identity, text messaging, avoid interference and drop calls and could handle a large number of calls.
2.5G Between 2G and 3G. Provided faster services than 2G and can access the internet.
3G Suitable for high speed data application, traditional voice calls, provide navigational maps, web browsing, fax, paging, email, video conferencing, multimedia, TV streaming.…