neither of the above. in fact, no numbers start with 555 except directory assistance (area code+555-1212). it's simply an agreed-upon (by the studios) placeholder to keep people from calling numbers they see on TV and in movies and bothering the unfortunate souls who have them in real life. there is no law, as far as i know, to keep filmmakers from using numbers that don't start with 555.
famously, the Tommy Tutone song Jenny (867-5309) has driven phone subscribers unfortunate enough to get that number insane. many area codes have permanently unassigned it for that reason. meanwhile, the person who has the manhattan version of that phone number recently put it up for auction on eBay. you can see the whole story here.
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- christ@myself.com - fuck a cat, kill yourself - my alter ego has five stars