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Glossary
150
PIN (Personal Identification Number)
Security code that protects the phone/SIM against
unauthorised use. The PIN is supplied by the
service provider with the SIM card. It may be a four
to eight-digit number and can be changed, as
required.
PUK (PIN Unblocking Key)
Security code used to unlock the phone when an
incorrect PIN has been entered three times in
succession. The eight-digit number is supplied by
the service provider with the SIM card.
Roaming
Use of your phone when you are outside your home
area (when travelling for example).
SDN (Service Dialling Numbers)
Telephone numbers supplied by your network
provider and giving access to special services, such
as voice mail, directory inquiries, customer support
and emergency services.
SIM (Subscriber Identification Module)
Card containing a chip with all the information
required to operate the phone (network and
memory information, as well as the subscriber’s
personal data). The SIM card fits into a small slot
on the back of the phone and is protected by the
battery.
Glossary
151
SMS (Short Message Service)
Network service sending and receiving messages to
and from another subscriber without having to
speak to the correspondent. The message created
or received can be displayed, received, edited or
sent.
Soft Keys
Two keys marke
d and
on the phone, the
purpose of which:
•Varies according to the function that you are
currently using
• Is indicated on the bottom line of the display just
above the corresponding key
Tri Band
Ability to handle any of the following types of
network: GSM 900, GSM 1800, combined GSM 900/
1800 and GSM 1900 MHz bands, for greater call
success and wider roaming.
Your phone automatically searches for the last
network used. If, for any reason, this network is
unavailable, your phone will attempt to register
with a different network.
Voice Mail
Computerised answering service that automatically
answers your calls when you are not available,
plays a greeting (optionally in your own voice) and
records a message.