Glossary207Phone passwordSecurity code used to unlock the phone when you haveselected the option to lock it automatically each time itswitches on.PIN (Personal Identification Number)Security code that protects the phone againstunauthorised use. The PIN is supplied by the serviceprovider with the SIM card. It may be a four to eight-digit number and can be changed, as required.Proxy serverA proxy server resides between a Web client, such as aweb browser, and a real Web server and acts as anintermediary between them. When some people browsea web site, their browser is not actually connecting tothe web server. The request from their browser goes to aproxy server, and the proxy server makes the request tothe web server.A proxy server can improve performance for groups ofusers because it caches the results of all requests for acertain amount of time. If a user requests a web pagethat it already loaded for another user, it reloads thepage instead of forwarding the request to the Webserver, which can be a time-consuming operation.PUK (PIN Unblocking Key)Security code used to unlock the phone when anincorrect PIN has been entered three times insuccession. The eight-digit number is supplied by theservice provider with the SIM card.RoamingUse of your phone when you are outside your home area(when travelling for example).
