In any case, 3D Touch allows us three new features—Peek, Pop, and Quick Actions. In addition to sounding like stuff that happened that year that you went to summer camp, these abilities do different things when you press with varying levels of force on your screen. In general, a Peek is a lighter press to preview something, like an email in your inbox or a website link; a deeper press on something you’ve previewed will Pop you into the full version of the item in question.
My favorite usage for Peek is in Mail—if you press on an email, you’ll get a fast preview of its contents.
While your finger is still on the screen, swipe left to delete or right to mark the message as read/unread.
You can also swipe up to get more options for what to do with the message.
If you then decide that you’d like to check out the entire email rather than its preview, just press a bit harder on the screen, and that’ll Pop into it.
So that’s my favorite new thing to do with the Peek/Pop functionality. Quick Actions, on the other hand, often involve app icons. For example, you can press with a little bit of force on the Phone app and get a convenient way to call your favorite folks. One of the coolest uses, though, involves pressing on the Maps app.
As you can see, doing so will bring up a quick menu, with choices such as routing yourself home, sending your location to someone else, or marking where you are (in case you need to remember where you parked, say).
Another one of my favorite things to do with Quick Actions is with the Safari app icon.
My favorite feature there—New Private Tab—saves quite a few steps from the way we’d do that previously, but it also will let you open your bookmarks or your Reading List quick as a wink, too.
Oh, and one more thing. If you wanna adjust the sensitivity of 3D Touch, just open Settings> General> Accessibility> 3D Touch on your iPhone. There’s a pretty little image in there for you to practice the different options on, so you can get Peek and Pop to work exactly like you want ’em to.
If you want to try out some 3D Touch-ready apps but aren't sure where to start, Bryan Chaffin put together a great list.
Peek. Pop. I’m still not sure if Apple’s new features sound more like Smurf names or something way more offensive than that. I guess they’ve left that particular decision up to us.