If you don't use it, you can usually get rid of it.
Do you have a folder full of first-party, preinstalled iOS apps that you don’t use? Sure, we all do. We’ve all learned to live with this folder over the years, even as more and more of these icons have slowly crept onto our phones.

Well, no longer—in iOS 10, many (though not quite all) of the built-in system apps can be deleted just like any other app. The complete list of apps that can be removed, per the Apple Support document:

Calculator
Calendar
Compass
Contacts
FaceTime
Find My Friends
Home
iBooks
iCloud Drive
iTunes Store
Mail
Maps
Music
News
Notes
Podcasts
Reminders
Stocks
Tips
Videos
Voice Memos
Watch app
Weather
Apple warns that deleting apps may affect “related system functions” and “data on your Apple Watch,” and it says that all of the apps together consume around 150MB of space.

Once deleted, the apps can be downloaded again from the App Store if their absence is causing problems (and it may, since there still doesn’t appear to be a way to set a third-party app as the default handler for any particular type of link in iOS 10). Whether these apps’ presence in the App Store means Apple will begin updating them more frequently a la Android and Google Play isn’t clear, but in any case, the ability to nix the icons is a welcome change.