Id like to use the app store on ios 7.1.2

so i have a iphone 4 but its absolute ass :( it has only 6 gigs which is tbh incredibe i didnt even know these were sold for 6gb and so i cant even dualboot and for some reason ever linux version hates this phone so it never connects for legacy kit and not even sideloadly will accept this device as smth that would work. Its like this device is a cannibal and the softwares are humans. so how can i acces the bought apps thing?