...there's a very simple non-technical solution to this, but I won't tell you (read: "everyone" instead of "you" as we're on a public forum) what the solution is because after knowing it you may be more tempted to flee from an accident scene (you can probably figure out the solution by yourself if you have a brain and an opsec oriented mind) and I'd feel morally responsive for it :P
Due to the non-anonymous nature of current telephones, this is impossible.