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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 traveling for example).
SDN (Service Dialing 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.
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.
Glossary
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