How to check if somebody had done a data recovery on my phone? So I recently lent my phone to my father. He broke its display and took it to a service center for repairs, all unbeknownst to me. I am kinda freaking out now because, only a few months ago, I had various nude photos of me and my girlfriend saved on its internal memory. Even though I deleted them before handing it over to my father, I am pretty sure they can be recovered using appropriate software. Is there anyway to check if such an attempt was made? 

Model : Samsung Galaxy J1(2016) (pre-knox firmware)

Status : "unrooted" (checked immediately on deliver from the service center)
You're probably okay. If it was a few months ago, chances are the data has been overwritten by other files. If you're really worried about it, try DiskDigger. It needs root access for the best scan, but a basic one can be performed without.