Views: 2,535 www.xfinity.com activate : How to Activate Your Xfinity Self-Install Kit Devices Go online to xfinity.com/activate for easy step-by-step activation instructions. If you’re activating your Xfinity Mobile device, go to xfinitymobile.com/activate. You can find this … Continue reading www.xfinity.com activate : How to Activate Your Xfinity Self-Install Kit Devices