You can turn off data on an iPhone all at once, for specific apps, or by turning on Airplane Mode through the Control Center. Here's how to do each.

Your iPhone's cache memory helps keep things zippy, but it can slow down as unused and corrupt files accumulate. Fortunately, a regular spring clean can help.

You can easily remove an email account from your iPhone — from the Mail app and any other apps it's connected to — through your iPhone's Settings app.