As a Comcast customer, you are priority number one. … Business account and get troubleshooting help for your. If you still can't access Xfinity Login Phone Number then see Troublshooting options here. The fastest way to contact XFINITY Mobile, the best XFINITY Mobile phone number available and their other best contact information, with tools and instructions for skipping the wait and resolving your. ContactForSupport » ISP Provider » Comcast Xfinity Phone Number. In order to enjoy new services or upgrading your services and questions related to pending orders you can call on the above phone number. Comcast Customer Service is here to provide Help and Support for your Xfinity Internet, TV, Voice, Home and other services. This makes it faster for Xfinity agents to pull up your account and answer your questions. You can reach the Xfinity Number for queries on new Xfinity Mobile connections, billing or cancellation, internet plans, prepaid subscriptions, or other questions. Contacting Xfinity Customer Service Center Xfinity is a cable, telephone and Internet provider operated by Comcast. The headquarter of Xfinity Communication is in Philadelphia, Pennsylvania.