Subscriber Identity Module
A Subscriber Identity Module (SIM) is part of a removable smart card ICC (Integrated Circuit Card) also known as SIM Cards, for cellular telephony devices such as mobile computers and mobile cell phones. SIM cards securely store the service-subscriber key IMSI (International Mobile Subscriber Identitiy) used to identify a subscriber. The SIM card permit users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or broadband telephony device.
A Subscriber Identity Module (SIM) is part of a removable smart card ICC (Integrated Circuit Card) also known as SIM Cards, for cellular telephony devices such as mobile computers and mobile cell phones. SIM cards securely store the service-subscriber key IMSI (International Mobile Subscriber Identitiy) used to identify a subscriber. The SIM card permit users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or broadband telephony device.
SIM cards are available in two standard sizes. The one is the size of a credit card dimentioning (85.60 mm × 53.98 mm x 0.76 mm) and the second most popular miniature-version has a width of 25 mm, a height of 15 mm, and a thickness of 0.76 mm. Most SIM cards are supplied as a full-sized card with the smaller card held in place by a plastic links and can be easily broken off to used in a phone that uses the smaller SIM.
The first SIM Card was made in 1991, with Munich smart card maker Giesecke and Devrient selling the first 300 SIM cards to Finnish wireless network operator Elisa Oyj (formerly Radiolinja).
No comments:
Post a Comment