Available to Subscribers of: Charter Communications, Comcast, Cox Communications, Time Warner Cable, Verizon FIOS We know of at least 5 providers that are having an HBO & Cinemax free preview for this weekend! Click on any of the links for more details on the free preview. Time Warner Cable is having a free preview starting tomorrow (Friday, June 12) and running through Tuesday morning (June 16). Cox Communications free preview also starts tomorrow and ends on Monday (June 15). There is a free preview of HBO & Cinemax for Verizon Fios starting tomorrow (Friday) and running through Monday. Comcast Communications customers can enjoy a Comcast free preview of HBO & Cinemax starting Friday and running through Monday. Charter Communications will be having this free preview starting tomorrow and running through Monday as well. It looks like Dish Network, AT&T U-Verse and DirecTV is not participating in this free preview - although DirecTV has a free preview of their Premiere Package coming up next weekend.