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Glossary
SDN (Service Dial Number)
Telephone numbers supplied by your
network provider and giving access
to special services, such as voicemail,
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 (up to
160 characters long) can be displayed,
received, edited or sent.