You can often successfully recover deleted files
from a PC, phone or camera memory card or USB Memory stick, it just depends on what's happened since the files were deleted.
When you delete files the data itself isn't deleted, just the index entry that says where the data for those files is located. The space containing the deleted files is also now marked as free space so it is available to the system for any new files to be written there instead.
If and when that happens, then it becomes too late to recover your deleted files so it is very, very important to not save any new files or data to the device concerned.
If the deleted files are on a memory card or USB memory stick, just don't save any new files to it.
One of the easiest ways to see if you can recover deleted files
is to try some file recovery software. Recommended asoftech data recovery as it saved my life many times.http://www.asoftech.com/adr/