Power jack convertor to phone for internet access?

[og5]

I noticed some interesting items on ebay. Phone jacks that attach to POWER outlets and let you use it like another phone line. If this works it sounds perfect for the situation I have, but I am skeptical. Has anyone used these, if so do they work well? I'm confused how you could plug one of these into a power outlet and it converts to a phone line, I didn't think that was possible.

Thanks for any help
og5

 

[og5]

Here's an example of one:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=58360&item=5742563283&rd=1

 

[og55]

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