All iPhone 7 Plus models have a 5.5 (diagonal) widescreen multitouch LED-backlit 1920×1080 native resolution Retina HD display (401 ppi, 625 cd/m2) and a taptic-engine powered solid state clickless Home button.

The iPhone 7 Plus has three cameras. It has dual rear 12-megapixel cameras (one wide-angle with an f/1.8 aperture and one telephoto with a f/2.8 aperture) that use software to emulate a 2x optical zoom as well as a 10x digital zoom. These rear cameras also provide optical image stabilization, a 6-element lens, and wide color capture. The front FaceTime HD camera is 7 megapixels and supports 1080p video capture.

The iPhone 7 Plus uses an aluminum case and is splash, water, and dust-resistant (IP67), but not water-proof, and it has stereo speakers and a Lightning port, but lacks a traditional headphone jack. It originally was available in five metallic color options — silver, gold, rose gold, and introduces two new options, black which has a black glass front and a matte black back; and jet black, which has a black glass front and a high-gloss black anodized and polished black aluminum back. On March 21, 2017, Apple also added a (PRODUCT) RED Special Edition which has a white glass front and a red colored aluminum back.

Internally, the iPhone 7 Plus is powered by a 64-bit Apple A10 Fusion processor with four cores — two high performance cores and two high efficiency cores — and has 3 GB of RAM, as well as 32 GB, 128 GB, or 256 GB of flash storage (jet black and red options only are available in 128 GB and 256 GB capacities).

Apple estimates that the iPhone 7 Plus provides up to 60 hours of audio playback, 21 hours of talk time on 3G, 13 hours of Internet use on 3G, 13 hours of Internet use on LTE, 15 hours of Internet use on Wi-Fi, 14 hours of wireless video playback and up to 16 days of standby time.