Original post by: ShirleyC190 ,
You can[http://www.androidphoto-recovery.com/how-to-backup-and-restore-deleted-contacts-on-android/|recover deleted files from internal memory] in Samsung with Android data recovery app. When you delete files the data itself isn't deleted, just the index entry that tells the system where the data for those files is located. The area containing the deleted data is also now marked as free space so it is available for any new files to be written there instead. If and when that happens, then it is 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.