Advertisements I've a friend that's asked Xfinity with no definitive answers. We're going to be installing a Premiere for OTA - he just got Xfinity Internet installed in his lake front property today. He was given a FLEX BOX. He's FiOS TV/Internet at his home in NOVA. Can he use the FLEX BOX he was given with the FiOS TV APP to watch his subscribed TV in his Xfinity connected lake front property? His install today was a bad experience for him but the Internet works so he's somewhat happy. Is he going to need to use a Roku device or something other than the FLEX BOX? Using his FLEX BOX can he use it like I'm guessing you would use a Roku - separate 'log-in' using his FiOS credentials for each channel?