Car Insurance Costs
Thanks for the question. Typically, Texas auto plans do not carry a cancellation fee.
It depends on the insurance company, but most will accept proof in the form of a utility bill or something similar to prove where you live. I recommend calling your insurance company to find out what documentation they will require to prove your residency and reinstate your policy.
It's very likely they will reinstate your policy if you pay the amount past due and any potential fees associated with the cancellation. Because each company has their own administrative rules regarding reinstatement, it's very likely for you to be able to get your policy active again.
Coverage & Claims
It is certainly possible that your insurance company will allow you to reinstate your policy, but there is likely a cut-off date so you should contact them ASAP to inquire about reinstating your coverage. Often times when a policy is cancelled for non-payment, the customer has a grace period to make payment and keep the policy active.