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4 Modem operation
After you have properly connected the Nokia 31 terminal to the data adapter, data cable and a PC,
you must enter an access code and install the proper software drivers for your operating system.
ACCESS CODES
You can use the access codes described in this section to avoid unauthorized use of the SIM card
in your Nokia 31 terminal. These access codes can be changed using the Nokia 31 Configurator
software or using specific AT commands via an appropriate software application such as
HyperTerminal.
PIN code
The Personal Identification Number (PIN) code protects your SIM card against unauthorized use.
The PIN code is usually supplied with the SIM card. When the PIN code request is enabled, the
code is requested each time the Nokia 31 terminal is switched on.
If the AutoPIN feature is enabled, the PIN code will only be requested the first time you configure
the Nokia 31 terminal.
PIN2 code
The PIN2 code, supplied with some SIM cards, is required to access certain functions, such as
charging unit counters. These functions are only available if supported by your SIM card.
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