It may seem obvious to some, but I've discovered lately that some people just don't know where the phone options are on BlackBerry 10. So here's a quick one for you!
Open up the phone app, swipe down from the top of the screen, and then tap Settings. There's also an option to clear the call log here:
In the options you can configure:
Call audio levels
Voice mail number and password
Holster and Bluetooth answer settings
Toggle call waiting
Change your number visibility
Limit allowed outgoing numbers to a selection (fixed dialling)
There is also a Call Summary screen that shows you not just how much you've used the phone, but also how much you've talked on BBM.
It may seem a little odd that these options aren't in the main Settings app, but they are still easy to get to.
What's your most important feature in the list? Tell us in the comments.