Hey, So the most likely reason for missing pictures is because
your phone has automatically uploaded them to a secure place
on the internet and deleted them off your phone to save up on
storage space. If you check for you photos in apps that should be
already on your phone that
do this like "Photos" (The google photos app)
[image|1471516]
or "one drive" This is the most likely place they will be stored.
The chances that some one had hacked into your phone and
deleted all your photos is '''Very''' Unlikely as they wouldn't
gain anything from this and they if they wanted the photos
they wouldn't of deleted them as they wouldn't of wanted
you to realise.
Not trying to scare you or anything.