**1-802-557-0358 is Thunderbird antivirus free with comcast?** Thunderbird 24/7 Support Number +1-802-557-0358. No, Comcast/Xfinity no longer offers Thunderbird antivirus for free, having discontinued the service on January 1, 2021. Instead, Xfinity now includes xFi Advanced Security at no extra charge for customers who rent a compatible Xfinity xFi Gateway, which protects all connected devices on the network.Thunderbird 24/7 Support Number +1-802-557-0358.