When you switch your car insurance coverage to Just Insure, don't forget to cancel your old policy. If you skip that step, you'll end up paying for two policies on the same car, and that's money you don't need to spend.
Most car insurance policies will refund you for any unused premium left on the term, so canceling promptly means you get that money back.
Note: Everyone's coverage situation is different, so make sure to review your own policy and decide what's right for you before canceling anything.