Well, I know, it can be quite time-consuming if you want to get rid of hundreds of emails. Unfortunately, there is no Delete All option on iOS 10. If you use IMAP for your email (most likely you do), a better way to remove multiple emails is to log into your email account via a web browser.
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Hold your finger on any app until they being to shake than on the top left corner of the app badges, a small "x" will appear. Tap the "x" and it will say "delete [app name] deleting [app name] will also delete all of its data" select "delete" and the app will disappear from the phone will all of its data and all the apps fallowing it will shift to fill its place.
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Why Can't I Delete Apps on my iPhone? - Solve Your Tech
How to see which apps are draining your iPhone battery the