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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
travelling 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.
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.
Soft Keys
Two keys marked
and
on the phone, the purpose of
which:
Glossary
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