Y is my gallary dissapeared

[AC Question]

My gallary has just deleted itself.only recently got old pics,videos back and I haven't set up a touch code on phone now all of a sudden I've got one.which obviously I don't have a code for never had one help please

 

[B. Diddy]

Welcome to Android Central! Which phone? Where were the photos saved to -- Internal Storage or the SD card? By "touch code," do you mean a PIN for the lockscreen? Does this mean you're locked out of the phone?