How Do I House Train My 2 and a half year Old Dog I KNOW IM LATE Im 13 And My Dad Keeps Him LOCKED IN THE CAGE?

My Dog Needs To Be Able To Walk Around The ****** House Idc Wat My Dad Has To Say Keeping Him Locked In His Cage Is Cruel And He Needs To Fall In A Ditch My Dad Only Lets Me Let Him Out To Put Him In The Kennel Outside And Bring Him Back In And Put Him Back In The Cage I Want My Dog To Be Able To Walk Around The House Like Other Dogs My Dad Kept Him Like This For 2 and A Half Years And Wont Let Him Do Anything Besides Eat Poop And Pee Then Back To The Cage O Yeah And When My Dad Wasnt Here I Let Him Out Of The Cage To Play With Him In The Basement And When I Went To The Bath Room A Few Mins Ago He Munched My Cell Phone So I Put Him Back In The cage And Now My Dad Is Mad I Mean I Have Insurance On It IDK Wat To Do I Dont Want Him To Be Locked In The Cage For His Entire Life My Dads A Douche I Hate Him I Want To Do Something For My Dog But I Cant My Dads In The Way Wat Should I Do I Need Help