The key differences between the iPhone 15 and iPhone 15 Plus come down to size, battery life, and price: Size: iPhone 15: 6.1-inch Super Retina XDR display iPhone 15 Plus: 6.7-inch Super Retina XDR display The Plus model is larger and offers more screen real estate, ideal for users who prefer bigger phones for media consumption or productivity. Battery Life: iPhone 15: Up to 20 hours of video playback iPhone 15 Plus: Up to 26 hours of video playback The iPhone 15 Plus, with its larger size, packs a bigger battery, resulting in longer battery life.