001-0003-832 Rev3
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One of the key features of GSM is the Subscriber Identity Module (SIM), commonly known as a SIM
card. The SIM is a detachable smart card containing the user's subscription information. This allows
the user to retain information after switching modems. The SIM has a security feature which, when
enabled, will require the user to enter a valid PIN before the modem will connect to the cellular
network. Selecting
SIM Settings
from the left menu bar brings up the SIM Settings page. When a
new modem is powered up with an active SIM card, the PIN status may initially be disabled as
shown in Figure 4.1.
Figure 4.1: SIM Settings page, SIM accepted, PIN disabled
