A SIM or subscriber identity module
is a smart card inside the GSM cellular phone that stores International Mobile
Subscriber Identity (IMSI) to identify and authenticate the user on mobile
telephony devices. SIM is a small card that contains programming and
information such as phonebook entries. The major advantage of GSM architecture
is that the SIM can be moved from one mobile station to another.
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Depending on its size, the SIM can
be classified as
- Full-size
- Mini-SIM
- Micro-SIM
- Nano-SIM
- Embedded-SIM
SIM cards are necessary in all cell
phones for connecting to any particular network. The flash memory integrated in
SIM cards also works as a memory card for storing the information such as
phonebook contacts, messages, and others. Most of the currently available SIM
cards come with the capacity of 32 or 64 KB of storage for holding the personal
identity information, and other data. With the incorporation of multimedia
functions in mobile phones, the need for SIM cards with more memory storage
capacity is increasing. Hence, SIM card manufacturers are engaged in developing
SIM cards with superior storage capacities, allowing the storage of all kind of
digital files.
SIM card is proving as an
alternative solution to the memory cards; however, they are not compatible with
other devices except cell phones. SIM cards act as an in-built storage as they
are not that portable. Additionally, there are very few card readers that
support the format of SIM cards, which is limiting the use of SIM cards as
memory cards.
Some of the key players engaged in
manufacturing of SIM cards include Datang Microelectronics Technology Co.,
Ltd., Ebtikar Card Systems, Gemalto NV, Giesecke & Devrient, Eastcompeace
Smart Card Co., Ltd., KEBTechnology, Eastcompeace Smart Card Co., Ltd.,
Solacia, TianYu Inc., and Watchdata Technologies Pte Ltd., Morpho, Oberthur
Technologies, and others.
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