It is possible but against the "rules". I will have to find the link, but I believe they say that the information must be publicly available and correct.
The company I get my domains from sent me mail the other day asking me to review the whois info, here is what it said:
Quote:
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As the registrar of your domain, we are required by ICANN to send you this message once a year, and help you keep the contact data associated with your domain registration up-to-date.
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I will poke around at ICANN.