The iPhone 8 Plus uses an "aerospace-grade" aluminum alloy case reinforced by steel and has a glass front and back. It is splash, water, and dust-resistant (IP67), but not water-proof, and it has stereo speakers and a Lightning port.

The iPhone 8 Plus has a 5.5" (diagonal) widescreen multitouch "True Tone" LED-backlit 1920x1080 native resolution "Retina HD" display (401 ppi, 625 cd/m2) and a taptic-engine powered solid state "clickless" Home button.

The iPhone 8 Plus has three cameras. It has dual rear 12-megapixel 4K 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 "portrait mode" and lighting software in addition to 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 cameras support motion tracking and offer augmented reality support.

Internally, the iPhone 8 Plus is powered by a 64-bit "Apple A11 Bionic" processor with six cores -- two performance cores and four high-efficiency cores -- and has 3 GB of RAM. It also supports 802.11ac Wi-Fi with MIMO, Bluetooth 5.0, LTE (4G), and NFC for Apple Pay.