How to recover data from once disabled resorted iphone?

I know there's a way since iphone memory is like pc's memory and when a file gets deleted its just lost somewhere in the memory waiting to be replaced and can be recovered using pareto logic but since i have this problem on an iphone i don't know what to do

Added (1). i didn't back em

If you regularly synced your iPhone with your computer the files are on your computer and can be synced back through iTunes on your PC. But if you didn't regularly sync it you should ask a techy person, and not me.

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