Not only are they not fake, but you can have one today!
Callcentric is an "internet phone service", which has been around for at least 8+ years. They allow you to search for unused phone numbers [1] in various area codes [2]. I searched for unused 555 numbers in the following area codes (213, 310, 626, 818) all have some available! So, you could create an account, and for something like $3/month, forward this 555 number to your existing number [3].
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Not only are they not fake, but you can have one today!
Callcentric is an "internet phone service", which has been around for at least 8+ years. They allow you to search for unused phone numbers [1] in various area codes [2]. I searched for unused 555 numbers in the following area codes (213, 310, 626, 818) all have some available! So, you could create an account, and for something like $3/month, forward this 555 number to your existing number [3].
[1] http://www.callcentric.com/did_lookup.php?type=check_by_us_n...
[2] http://www.bennetyee.org/ucsd-pages/area.html
[3] http://www.callcentric.com/dids/phone_number_sale