Yes, it is possible to add additional lines to an XFINITY Mobile account. XFINITY Mobile allows customers to add multiple lines, making it convenient for families or individuals who wish to manage several devices under one account. The process typically involves accessing the XFINITY Mobile app or the XFINITY website to manage your account. Once logged in, you can navigate to the section for adding lines, where you will find the options to select compatible devices and plans. It is also helpful to review the various pricing options and data plans available to ensure that you select what best meets your needs. For the most current details and any specific requirements, checking the official XFINITY Mobile website will provide the most reliable information.