You can repurpose an old iPhone or iPad as a digital photo frame using built-in iOS features like StandBy.Create a dedicated album in Photos and start a slideshow using Guided Access to prevent exiting or using other apps.Adjust settings to keep the display turned on and set up the slideshow for continuous playback with cool transitions.Use a MagSafe or wireless charger for a clean look and optimal viewing position on a stand.Export Photos slideshows as videos and play them on repeat in media players like VLC.Utilize the StandBy feature on iPhone for shuffling through photos in landscape orientation when charging.Explore digital photo frame apps like Digital Photo Frame Slideshow, which offers customization options and timer functionality.Other recommended apps include Shuffle Photos, PixFolio, and LiveFrame for creating slideshows from your Photos library.Consider purchasing a dedicated digital photo frame for features like auto start, sleep timer, and adequate onboard storage.When buying a digital frame, ensure it doesn't upload photos to the cloud and allows easy media transfer via USB or SD card.