How to stop apps syncing from iTunes to iphone?

My nephew has downloaded a lot of games from the iTunes Store on both my phone and ipad, and it gets annoying for me having to wait for the games to transfer from both electronics onto iTunes, I remember there was a way how I stopped the apps syncing onto my phone but I forgot how, is there a way to stop it because transferring it and waiting for it has made me so frustrated!

Well, I know if you deaurthorize the device your paid apps won't sync. I just found this out yesterday because a device I wasn't working on weren't syncing.

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