this is fake first of all so its a illusion best words in order for chromecast to work it must connect to wifi as a hub it piggy backs its moving signal I chose those words carefully for reasons so........try disconnecting wifi from xfinity service provider leaving network intact it will not work as it piggy backs the ''moving signal'' to allow mirroring to tv in my case I'm using directvnow the new thing allows free dataas long as go threw AT&T for receiving signal however as long as a wifi network signal is present it uses it over mobile data ''defeats purpose'' for most part chromecast does the work for you but it is using the wifi and if you actualy try what says and shows in video as I did you will find out the first phone must use wifi and ''others'' can connect you you as a hotspot to transmit to tv threw youre phone on ''hotspot'' its a ketcha22 ....incase others looking for same solution and takes time to read this only way is turn off wifi on phone and use a direct connection phone to hdmi also known as a 'MHL' connection adapter ebay has this is searched link ------MHL Micro USB to HDMI 1080P HDTV Cable Adapter for Samsung Galaxy ---- I offer free assistance threw my business email (removed by moderator).....happy to help if I can