As I've said before, when anonymous phones are outlawed, only outlaws will have anonymous phones. We don't need more laws, we need fewer lazy detectives. It's not who the phone is registered to that matters, it who is called from the phone that tells the tale.
Caller ID was a big step in the right direction for putting control back in the hands of the person answering the phone, but the ability to change phone numbers and registration info on a whim lends me much greater control than Caller ID offers. I don't get phone calls from people I don't want to talk to anymore because they simply have no idea where to find my number. And I like it like that, lol!
And I don't have any illusions that anonymous phones are truly anonymous. If you want proof that they're not, take a GoPhone phone number and establish an account for it on Cingular's website. You can then track city & state where every call was made from, the number called, length of call, etc. Tracfone (perhaps the epitome of anonymity when it comes to prepaid phones?) runs some of its phones off the Cingular network. While access to these features is disabled by Cingular for Tracfone users, I'm sure law enforcement could access the records in a heartbeat, with or without a warrant.
LIBERTARIANS AND THE PRIVACY OF FRIENDS
http://www.theclairefiles.com/Personal/libspriv.html
Okay, I'm seriously rambling now... Off to bed... :-)