How SIM-card was developed: its history and establishment
Learn more information about creation and evolution of SIM-card.
It is not easy to surprise someone today with microcomputer – they surround us all the time. They are not currently restricted with PDA or calculators but its number includes a great deal of microcontrollers, which are invading into our life, including SIM-card. All those appliances, released by different companies, have different architecture and parameters. A lot of people use one of such microcomputers but do not even guess that it is called in such way.
You can find microcomputers in SIM-cards, which are used for cell phones of GSM standards. More than milliard of people uses SIM-cards today.
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Appearance of SIM-cards in telephone world
SIM-cards are essential parts of cell phones, although the telephones of other different standards can be used even without them. So why were they developed? For mobile telephone to be served in any cell network, it has to be relative to this very network through which the connection will flow.
SIM-card history begins in 1980-1990-s years and counts just several decades. This appliance is relatively young and fresh in the world of technologies. To make any cell network available, telephone should have its identification, for network to address it somehow.
Let’s start from the very beginning. Telephone in cell network becomes relative going through the direction of registration. That is it has being registered with its name in the system – subscriber base. At that time usual indexes were like the names for telephones, they served the role of unique plant apparatus numbers and their electronic analogues – ESN (Electronic Serial Number).
Mobile telephone, addressing to cell network in order to make a call, automatically informed this unique number to network. The call from the side of the network to the telephone was transmitted analogously – through its Electronic Serial Number. However, at that point the problems started to appear. The number of cell phones manufacturers was growing. Each of them was using its own systems for identifying plant apparatus numbers. With such diversity there was no opportunity to unify the records in base.
To perform telephone registration it was necessary to bring it to cell operator. It was like that: changing every time the phone, subscriber had to take it to the department, which served cell network of the company. The task to avoid it was first mentioned in 1982 before the developers of new generally European digital standard of cell phone connection – GSM. That was a time when they decided to divide subscribers’ functions and functions of equipment identification. First recommendations were offered and published in 1990. From that very moment the history of SIM-card begins.
In GSM standard unique 15-digital number for telephone identification was used – IMEI (International Mobile Equipment Identity), which was assigned to every apparatus while production (this number could be visible under the accumulator of the telephone and on the phone box), and while the exchange was informed to a cell network.
All subscriber parameters are filled into the plug-in module SIM (Subscriber Identity Module), which is inserted into the telephone. All necessary data for identification of subscriber is saved on SIM-card. SIM-cards are being programmed previously and them they can be sold in any shop as a usual ready product.
Every user of SIM-card can easily – after the purchase – insert it in personal mobile telephone or without big efforts reinsert it to another cell phone. While this operation the user does not to need to go to a cell service company in order to perform any manipulations with this SIM-card.
Computer capacity of SIM-cards is commensurate with the first computers for personal usage of the 80-s of the last century. Due to achievement of contemporary microelectronics their possibilities are constantly growing.
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