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A Subscriber Identity Module (SIM) is part of a removable smart card ICC (Integrated Circuit Card), also known as SIM Cards, for mobile cellular telephony devices such as mobile computers and mobile phones. SIM cards securely store the service-subscriber key (IMSI) used to identify a subscriber. The SIM card allows 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 first is the size of a credit card (85.60 mm × 53.98 mm x 0.76 mm). The newer, more popular miniature-version has a width of 25 mm, a height of 15 mm, and a thickness of 0.76 mm. However most SIM cards are supplied as a full-sized card with the smaller card held in place by a few plastic links and can be easily broken off to be used in a phone that uses the smaller SIM. The first SIM Card was made in 1991, with Munich smart card maker Giesecke & Devrient selling the first 300 SIM cards to Finnish wireless network operator Elisa Oyj (formerly Radiolinja). The use of SIM cards is mandatory in GSM devices. The equivalent of a SIM in UMTS is called the Universal Subscriber Identity Module (USIM), whereas the Removable User Identity Module (RUIM) is more popular in CDMA-based devices. Many CDMA-based standards do not include any such card, and the service is bound to a unique identifier contained in the handset itself.
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Card Holder Subcategories
Card Holder Articles
Foreclosure Avoid It!
by Angela Giles
Apr 14, 2008
Did you know that there has been a 75% increase in foreclosures across the nation in the past year? On the street, where I live there are 7 homes in foreclosure right now. It is pretty scary for a lot of folks out there. Whether it is because of...
Becoming a homeowner: Now a plausible reality for poor credit holders
by joanne elizabeth
Feb 17, 2006
A home is not just a four-walled shelter; but for most of us it's a long cherished dream. It's a place where you treasure your fondest memories. You work hard each day in order to save ample funds to purchase a home that you can call your own. ...
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