SIM card
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A SIM card or SIM is a type of integrated circuit, often in the form of a smart card. They are intended to securely store an international mobile subscriber identity number and its related key, which
4-by-4-millimetre (0.16 in × 0.16 in) silicon chip in a SIM card which has been peeled open. Note the thin gold bonding wires, and the regular, rectangular digital memory areas.
The memory chip from a micro-SIM card without the plastic backing plate, next to a US dime, which is approx. 18 mm in diameter
X-ray image of a mini-SIM, showing the chip and connections
Embedded SIM from M2M supplier Eseye with an adapter board for evaluation in a mini-SIM socket
Code-division multiple access is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simult
SIM card
…address book contact information, and may be protected using a PIN code to prevent unauthorized use. These SIM cards are always used on GSM phones; for CDMA phones, they are needed only for LTE-capable handsets. SIM cards are also used in various satellite phones, smart watches, computers, or cameras. The…
A CDMA2000 mobile phone