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Glossary
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PIN (Personal Identification Number)
Security code that protects the phone against unauthorized 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 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.