Question: how to retrieve deleted files from sd card on phone?
Answer: Step 1: Don't do anything to your memory card once you realise photos have been deleted. ... 
Step 2: Select a recovery suite. ... 
Step 3: Install and set up the software on your PC or Mac.
Step 4: Let's start with Recuva first. ... 
Step 5: Run the scan and see what files it turns up.