yes that is true if you use a external proxy it wont show your ip as the webpage is opened at the proxy side before it is re transmited down to your screen. all sites will see your proxy address rather then your real external ip
the real meaning of proxy server is: proxy server is a computer that offers a computer network service to allow clients to make indirect network connections to other network services
most schools and computers use proxy servers to filter information and so on. for example if you use your 3g and are on any network and try browsing a adult site like gambling (i do love roulette) it says confirm your age by entering your bank details that is the proxy server picking it up as a age restricted site and pointing to another website.
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