Originally posted here by moxnix
It will show 'A' IP, but not one that is in any way connected to you. The pre-paid ISP's do not even have your name and or any information on you. It will show you are in Il. somewhere (the location of the 800# server). Anyone can buy them, and all you need then is a telephone and a computer.
If I'm not mistaken (and I do that a lot ) the ISP keeps logs of the time period you are online together the telephone number you used to dail in.

So if you would set up a pre pay ISP account, make some dummy e-mail, sent your mail and never use that account again, they could still track the IP of your account and thus through the logs your telephone number, even if you haven't told them anything about you, they can still track you is you used your phone.

So the telephone you are using to dail in plays a role too.