Samsung SGH-C207CSACIN - Manual (Page 212)

Glossary
211
Security code that protects the phone/SIM 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.
Proxy Server
A server that 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 fetched for another user, it returns the page
instead of forwarding the request to the Web server, which
can be a time-consuming operation.
PUK (PIN Unblocking Key)
Security code that protects the phone/SIM 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.
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