Chosen Solution

Had the battery replaced and now all the photos I have taken prior to this no longer show up on camera roll or under photos icon. Are they still there and can they be retrieved?

In this case, I suggest you to try some other data recovery software such as Dr. Fone iOS Data Recovery. Tutorial may be helpful: How to Recover Lost Data from iPod

if you change the galaxy s3 battery , would it delete pictures

Using a photo recovery software is the most effective way in my view. Of course, there are free programs for recovering deleted photos, but they all have limitations. Most free photo recovery software is limited in function or bundles some other annoying software/advertisement, even does not work at all without a continuous update for years. I advise you to try the free version of the Stellar Phoenix Photo Recovery software: https://www.stellarinfo.com/digital-medi… It gives free preview of photos before recovering so you can be sure you have the photos that you want to recover. It is one of the most powerful and user-friendly Photo Recovery software.

I there, I didn’t backup my pictures when apple store replace my iPhone battery, it’s possibly recover them?