Looks like this is the story: Fox has two 4K event channels. Fox Sports 1 and 2. Some other small cable companies have just recently added these channels. 1498, while not in the guide yet, is showing up as "Fios 4K1". 1499 is currently blank but that might change. Those are the channels for Fios customers to watch. Service Electric (depending on which one you're a customer of) has some 4K channels at 801-804. RCN's handful of 4K channels start at 1500. So 4K cable content is now available outside of Fios too.