For general queries, you can call the Aviva Car Insurance phone number, which is 1-800-387-4518. Phone lines are open from 8:00 a.m. to 8:00 p.m., Monday to Friday. If you want to file a claim, you can call Aviva 24/7 at 1-866-692-8482. You can also file a claim online by filling a form out or using Aviva’s mobile app.