Q: can I use iPhone 6 case for iPhone 7 or not?

In some cases, you can use iPhone 6 cases for the iPhone 7. The iPhone 7's camera is larger, so cases with precision built for the iPhone 6 will not fit the iPhone 7. I love my iPhone 6s Smart Battery Case: Apple just came out with a new one for the iPhone 7. Because of the larger camera, you would want to get the new battery case.

The first link is the link to the iPhone 6 and 6s battery case, which states that the case is only compatible for iPhone 6 and 6s. The second link is the link to the new iPhone 7 battery case, if you're interested. Two noticeable differences are in the white case, the plastic ring around the camera module is gone, and the black Apple logo is now grey.

http://www.apple.com/shop/product/MGQL2LL/A/iphone-6s-smart-battery-case-charcoa l-gray

http://www.apple.com/shop/product/MN012LL/A/iphone-7-smart-battery-case-white?fn ode=97