The phone number of F-Secure Antivirus Customer Service is 866-476-0216. The F-Secure Antivirus Customer Service is live from Monday to Friday 09:00 am - 06:00 pm. Closed on Public holidays and weekends. You can also chat live with an expert, to chat with a F-Secure Antivirus customer service, click on the chat box in the bottom right of the F Secure website. If the phone support and chat help are offline, you can seek help from the FAQs or from the F Secure community pages.