The iPhone 7's overall design is similar to the iPhone 6S, but introduces new color options (matte black and jet black), water and dust resistance, a new capacitive, static home button, and removes the 3.5 mmheadphone jack. The device's internal hardware also received upgrades, including aheterogeneousquad-coresystem-on-chipwith improved system and graphics performance, and upgraded 12 megapixelrear-facing cameras with optical image stabilization on all models and an additionaltelephoto lenson the iPhone 7 Plus model to provide enhanced zoom capabilities.
Reception of the iPhone 7 was mixed. Although reviewers noted the improvements to the camera, especially the dual rear camera on the Plus model, they also stated that the iPhone 7 did not make significant changes to the display or build quality, where competing flagship smartphones surpassed the quality of the iPhone 7.
Many reviews highlighted the controversial removal of the 3.5 mm headphone jack; some critics argued that the change was meant to bolster licensing of the proprietaryLightning connectorand the sales of Apple's own wireless headphone products, and questioned the effects of the change on audio quality. Apple was also mocked by critics forPhil Schiller's statement that such a drastic change required "courage".
The iPhone 7 has been the subject of several reported issues, most notably a hissing noise during heavy usage of the phones and significant differences in performance between device variants. Apple has not released sales numbers for iPhone 7, but multiple U.S. carriers reported that it was in high demand on launch. Subsequent reports at the end of 2016 stated that Apple had reduced production of the models due to "sluggish" sales and decreasing demand, though sales research after the first quarter of 2017 placed the devices as the best-selling smartphones in the world.