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Note: USSD messages can only be sent to the network, not directly to another mobile
terminal.
S
UPPLEMENTARY SERVICES
The Nokia 31 terminal also supports additional network dependent services such as:
Call forwarding – forwards your calls to another number which you specify.
Call restriction – restricts outgoing and incoming calls.
Call transfer – connects two different callers with each other then disconnects one's own call
without disturbing the other two callers.
Call waiting – alerts you to an incoming call during a phone call.
In-call handling – switches between incoming and active calls.
Multiparty call – connects several callers in a single conversation.
Security option – allows restrictions such as call barring.
S
ECURITY
By default, the Nokia 31 terminal uses a standard PIN request. For additional security, there is an
"AutoPIN" feature which can be configured to relay the PIN code to the terminal's memory and
make the SIM card useless to any unauthorized user. The AutoPIN feature is activated by
connecting the Nokia 31 terminal to a PC and running the Nokia 31 Configurator software located
on the Nokia 31 CD-ROM or downloadable from www.americas.forum.nokia.com. The Nokia 31
terminal also includes security-related features such as GSM security codes and GSM encryption.
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2002 Nokia Corporation. All rights reserved.
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