How to improve? Cleaner softwares can do nothing but deleting my chatting record, photos and downloaded files, but all of them only take up 15GB including all the apps, games, ets.

I've seen a post three year ago where one is complaining his 6GB device has a 3GB system data. Someone has said that system data is only changed during system installation. I'm not sure of that, since no one would likde to buy a 64GB phone and found he can only use 32G of it. So, how can it grow so large during the recent year? I cannot understand...

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