To cancel your policy, you’ll have to write, fax, or email a letter stating that you want to cancel your policy and the date of cancellation. Calling your insurance agent may be a quicker way to cancel your policy, though most insurance companies will still require a signed letter of cancellation. You can have your representative give you more information about their process or have them send you the required documentation.
Make sure you get a confirmation of cancellation from your insurer. You may be charged a small cancellation fee, but they should also refund or prorate the premium you have already paid towards your policy.
Best of luck with the move!