Why does auto insurance cannot just cancel my policy?

Vanessa Hudgens says:

Most likely if you fax them proof of your new insurance then they won't have to report you to the state for canceling your auto insurance with them.Having auto insurance is to protect the rest of the world from an accident that you might create so it is required by (most?) state laws.However, to be sure, it is simple to ask them why and and get their answer.

miley cyrus says:

Best Answer – Chosen by Voters Well i know that when you sign up with a new company the new company usually wants to know that you were insured… however i dont recall ever the OLD company needing proof to cancel. That does sound correct to me. Try calling back and saying you sold your home and cars and no longer need insurance on them. Then they cant really complain. They may want to know WHO you switched to, to then try and compete with them and know for marketing reasons. Now it may vary by state, and your particular state may not allow cancel of coverage until new one is established for liability reasons. But… i dont know, sounds strange to me.