Apple is probably going to have another big hit on its hands with the iPhone 6s and 6s Plus. In addition to the new custom aluminum alloy for the case, the first-ever Ion-X screen and a faster processor, the 6s series has two significant upgrades from past iPhones.
The most obvious is the new 3D Touch screen that responds to how hard you press it, which is either going to be a game changer or a stumbling block for a lot of users. However, right now we're concerned with the other upgrade, which could turn into a major headache if you buy one version of the iPhone.
For the 6s series, Apple finally replaced the solid-but-aging 8 megapixel camera from previous iPhones with a new 12 megapixel model. In addition to the increase in pixels, there's a new image signal processor, new pixel technology that reduces interference, and other little tricks to improve photo quality.
In addition to better image quality, the new camera brings two features. The first is that you can shoot video at 4K resolution, also known as Ultra HD. This blows other smartphones that shoot 1080p out of the water.
The second feature is Live Photos. When you tap the screen to take a photo, by default it doesn't just capture a single frame, but 1.5 seconds before and after you tapped, or 3 seconds total.
Later when you're looking at photos, a hard press on the photo will play the full recording, along with audio. Suddenly, pictures of your kids will come alive, or you'll be able to watch a surprising moment that happened right after the photo was taken.
These are all impressive features, but to take advantage of them, there's one model you can't buy.