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A look at the differences between the iPhone 7 and 6

The new iPhone prompts questions about how it differs from previous models. Here are some answers.

I have an iPhone 6 I purchased in November 2014 with a warranty, which expires in November 2016. Is it worth it for me to purchase an iPhone 7?

Based on speed alone, it is probably worthwhile to upgrade if you currently own an iPhone 6. The iPhone 7 is significantly faster than the iPhone 6. In speed tests conducted with the app Geekbench 4, the iPhone 7 was 114 percent faster than the iPhone 6.

gt;Other than that, the iPhone 7 camera is significantly better than the one on the iPhone 6. And when you consider the benefits of the iPhone 7's being water-and dust-resistant, overall this is a meaningful upgrade if you own an iPhone that is at least 2 years old.

What is the weight difference for the new phones compared with past models?

For the iPhone models with the 4.7-inch screen size, Apple's specifications state the iPhone 6 from two years ago tipped the scales at 4.55 ounces and last year's iPhone 6s came in at 5.04 ounces — but the iPhone 7 dips back down to 4.87 ounces. In the 5.5-inch screen category, the larger iPhone 6 Plus model has a listed weight of 6.07 ounces and the iPhone 6s Plus is 6.77 ounces, but the iPhone 7 Plus edges down to 6.63 ounces. In comparison, the lightest model currently for sale is the iPhone SE, which was released earlier this year. The iPhone SE, with a smaller 4-inch screen, is a comparatively svelte 3.99 ounces.

Can other brands of wireless headphones be used with the new 7? Or are you limited to the Apple headphones because of a new type of chip in the device?

The iPhone 7 supports the open Bluetooth standard, so third-party wireless headphones will be compatible with it. The proprietary chip you are referring to, called W1, is inside the AirPods, Apple's new wireless earbuds. The AirPods will work only with Apple devices.

How does the iPhone 7 camera differ from the ones on the iPhone 6 and 6s?

The iPhone 6 line of 2014 had an eight-megapixel camera with a five-element lens, f/2.2 aperture, a True Tone Flash, face detection and other advanced features; the larger 6 Plus also provided optical image stabilization. The iPhone 6s series bumped up the camera resolution to 12 megapixels and added the animated Live Photos feature and 4K video support — but kept the five-element lens and f/2.2 aperture, while optical image stabilization stayed exclusive to the Plus-size version.

However, the iPhone 7 provides optical image stabilization in both the regular and supersize models, and upgrades the hardware to a six-element lens for more colorful photos with greater image detail. The lens also has a larger aperture of f/1.8 and this year's iPhones have a flash that is 50 percent brighter than the one on last year's models.

The bigger iPhone 7 Plus adds a second camera on the back — a 12-megapixel telephoto unit with a f/2.8 aperture, as well as optical and digital zoom.

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