I admit, the biggest reason why I upgraded to iPhone 7 Plus was to get access to the new iPhone camera feature, PORTRAIT. According to the Apple website, the Portrait mode is described as follows:
It's easy to take stunning portraits with your iPhone 7 Plus. Portrait mode uses the dual cameras on your iPhone 7 Plus to form a depth-of-field effect. This lets you compose a photo that keeps your subject sharp while creating a beautifully blurred background.
It does take some practice to figure out how to use the Portrait mode and what subject or objects are best photographed in this particular mode. Here are some photos to give you a better idea of what the difference is between photos captured in regular camera mode vs Portrait mode.
In the following photo, shot in portrait mode, you can see how the background is blurred. But you can also see how the camera crudely blurs to closely crop to the subject that you are focused on.
Here is another more example so you to compare. Look carefully how blurring the background can affect the image that you want featured.
One of the best uses for portrait mode is shooting photos of people. The following photo is one of my daughter. We needed to attach a photo to one of her applications so we went outside to take advantage of the natural light and I used the Portrait mode to capture her smile.
I hardly ever carry a camera around anymore. I have my iPhone and it has a great camera that fits my needs and my amatuer photography skills.