Xfinity is the fastest, ranking. One of the biggest cable providers in America is Xfinity, along with a Comcast product. This ISP provides services across the country for wireless, phone, Wi-Fi hotspots, and internet. In approximately 39 states, including New York, Florida, California, Illinois, and others, it also provides hybrid fiber-coaxial (HFC) facilities. In terms of accessibility: Charter Spectrum, usually known as Spectrum, is the third-largest US internet service provider. Charter Communications, which is also owned by Bright Networks and Time Warner Cable, is the company that owns it. Los Angeles, Chicago, New York, and Orlando are just a few of the major cities in America that are covered by Spectrum internet plans.