I have a Samsung Galaxy ACE S5830. It's an Android, version 2.3.4 and uses Gingerbread I think?
I can take photos and they are in the gallery no worries. They stay for days or weeks. Then at other times, they just vanish. I don't 'share' them, or send them to another file/person. I don't delete them, I don't move them, copy them or anything.
I view them, some stay, some go. It's upsetting as some are of the DC. The ones of DS in particular as he has SN so I hate the fact that they just go. I have no control over this...... it's so random. 
I took some photos today and tried to send them to my Gmail account straight away and they just got 'stuck' and then vanished. The email arrived with no photos. I've done this before many times and all has been fine. 
I haven't backed my phone up as I have no idea how to. I don't have any software on my laptop to do so. Back up I mean so they're not there either.
Can anyone tell me how to recover lost photos from a phone? Please?