Samsung SGH-D500 Manual page 208

Glossary
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
unauthorised 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.
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 caches 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).
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