A Mobile Station consists of two main elements:
The Mobile Equipment or Terminal.
The Subscriber Identity Module (SIM).
•The SIM is a smart card that identifies the terminal. By inserting the SIM
card into the terminal, the user can have access to all the subscribed
services. Without the SIM card, the terminal is not operational.
•The SIM card is protected by a four-digit Personal Identification Number
(PIN). In order to identify the subscriber to the system, the SIM card
contains some parameters of the user such as its International Mobile
Subscriber Identity (IMSI).
•Another advantage of the SIM card is the mobility of the users. In fact, the
only element that personalizes a terminal is the SIM card. Therefore, the
user can have access to its subscribed services in any terminal using its
SIM card.
Mobile Station - SIM
