Accidentally deleted mobile photos?
Gone forever, and never seen again.
Check your Photo Stream or iCloud if its an iPhone. If not you might be up the river without a canoe.
Accidentally deleted photo, you can recover them by power data recovery
There is a free app, Lookout.com that has backups for everything you have put into your phone or pc, whatever, it's teriffic.
Directly on the phone, then you can not recover deleted, in the words on a computer can go to look for deleted recycle bin.