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Definitely get an unlisted phone number. You can also sign up for the phone line under a misspelled or fake name. Don’t put down you address when signing up for the phone line. Use something else like a post office box.
Request that web sites take down information with your name and/or address. Use an anonymous remailer for sending out e-mail. Change you e-mail address frequently. This is easy with free e-mail services like Gmail.
Don’t use credit cards at all. And don’t use your real name for anything. This just scratches the surface of how to lay low. I am sure you could write a whole book to take the undercover living to the next level. I found this all very interesting. I myself write under a pen name so stalkers have to work hard to determine my identity. So far it has worked for me.