For the love of god, can you read the rest of the thread? I didn't say it wouldn't work, I said the police wouldn't come looking for you if the phone wasn't associated with your account.
E911 requires phones to give the caller's location within 300 meters latitudinally and 300 meters longitudinally. A phone not attached to an account will still do that, but it will not give associated subscriber information because there is no associated subscriber.
I'm sorry, my last post used poor wording. The police *would* try to find you, but the person whose phone was stolen and is now being used to call 911 wouldn't get in trouble for it.