Can you still be passively traced if you bounce your connection through a phone number (in other words, does the phone number leave a log behind that can be traced)?

AFAIK, yes. Even though the player can't hack into a phone system and delete any logs, I believe that you are traceable through phone systems. I haven't tested this, though...

-- Griffinhart

Final Warrior:
Thank you for the reply. I've done some testing, and yes, you can be passively traced when using phone numbers.