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MMS (Multimedia Message Service)
A message service for the mobile environment, standardized
by the WAP Forum and the 3rd Generation Partnership
Program (3GPP). For phone users, MMS is similar to Short
Message Service (SMS)-it provides automatic, immediate
delivery of user-created content from phone to phone. The
message addressing used is primarily phone numbers, thus
the traffic goes from phone to phone. MMS also provides
support for e-mail addressing, so that messages can be sent
by e-mail. In addition to the text content of SMS, MMS
messages can contain still images, voice or audio clips, and
also video clips and presentation information.
Multi-party Calling
Ability to establish a conference call involving up to five
additional parties.
Phone Password
Security code used to unlock the phone when you have
selected the option to lock it automatically each time it
switches on.
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.
Glossary
198
Proxy Server
A proxy server resides between a Web client, such as a web
browser, and a real Web server and acts as an intermediary
between them. When some people browse a web site, their
browser is not actually connecting to the web server. The
request from their browser goes to a proxy server, and the
proxy server makes the request to the web server. A proxy
server can improve performance for groups of users because
it cache the results of all requests for a certain amount of
time. If a user requests a web page that it already loaded for
another user, it reloads the page instead of forwarding the
request to the Web server, which can be a time-consuming
operation.
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).
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
199
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