Glossary
141
B
Glossary
Term
Description
Dual Mode
Telephone
Telephone that operates with two standard
elements: GSM and WLAN
Protection
Messages that are sent as protected mes-
sages can only be read by certain people.
Messages sent to a portable telephone by a
digital telephone are often protected if oper-
ated wirelessly.
IMEI
The identification number for GSM tele-
phones. This number can be used to block
stolen cellular telephones.
ISP
A company that offers special services.
GPRS
Allows users to more quickly access and
send data from a cellular telephone.
GSM
Internationally recognised element for dig-
ital communication with a field of 800 MHz,
1800 MHz and 1900 MHz. It was introduced
in 1991 and is used predominantly in Asia
and Europe but not in the USA. GSM tele-
phones use a SIM card that contains the
user’s information. Every GSM is pro-
grammed immediately after the SIM card is
assigned, a feature that makes GSM tele-
phones easy to rent or loan to others. The
GSM offers an SMS service for sending text
messages of up to 160 characters to other
telephones that also operate with a SIM
card.
MMS
MMS allows users to communicate multi-
media data such as images, voice mes-
sages and video clips.
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