How to Play Slide Shows on Your iPhone
You can play slide shows of your photos on your iPhone. If you store a lot of photos or images on your iPhone, watching a slide show is a fun way to see them all.
Choose your Camera Roll or another album from the Photo Albums list.
To do so, tap the Photos icon from the Home screen or tap the Camera Roll button in the Camera application.
If you see the play button at the bottom of the thumbnails screen, tap it and you’re finished.
If you don’t see the play button at the bottom of the thumbnails screen, tap a thumbnail to choose a photo, and then tap the play button.
You may have to tap the picture a second time to bring up the play button.