Measuring in at 4.7 and 5.5-inches, the iPhone 6 and the iPhone 6 Plus dwarf earlier iPhone models, but at the same time, the two phones are Apple’s thinnest yet, measuring in at 6.9 and 7.1mm, respectively. For comparison, the iPhone 5s was 7.6mm thick.
The iPhone 6 has a 4.7-inch display with a "2x" resolution of 1334 x 740 (326 ppi) while the iPhone 6 Plus has a 5.5-inch "3x" resolution of 1920 x 1080 (401 ppi). Both phones offer higher contrast, better brightness, and improved white balance.
Design wise, the phones more closely resemble the iPad and the iPod touch than the iPhone 5s. Both models have soft, rounded corners and a curved glass screen that melds smoothly into the thin metal body of the device. The volume buttons on the left side of the device are pill-shaped, and the power button is located on the right side of the device for easier one-handed use.
The iPhone 6 and the 6 Plus continue to sport an 8-megapixel f/2.2 rear camera, but the addition of several new features result in vastly improved picture quality. Continuing to offer improved camera capabilities has always been a priority for Apple, with the company even opting to include a protruding lens design to avoid making image quality sacrifices for the sake of the thin design of the iPhone 6 and 6 Plus.
The first major new feature, "Focus Pixels," was designed to speed up autofocusing by providing the sensor with more information about an image, while improved auto image stabilization compensates for slight amounts of motion blur and hand shakiness. Focus Pixels vastly speed up autofocusing times and improve autofocusing in low light situations, as demonstrated in a review of the iPhone 6 and 6 Plus cameras.
Like the iPhone 5s, the iPhone 6 and iPhone 6 Plus continue to offer Touch ID, Apple’s fingerprint-based security system. Touch ID is used in place of a passcode on the iPhone, making it quicker to unlock the device and secure sensitive data within apps.
The iPhone 6 and the iPhone 6 Plus both offer improved battery life, but due to the larger size of iPhone 6 Plus, it is able to accommodate a larger battery. The iPhone 6 has an 1,810 mAh battery, while the iPhone 6 Plus has a battery capacity of 2,915 mAh.