2. Make it your data hub.
The iPhone has become the central data hub for everything I do. Whether it’s class notes, work emails, sleep data, website analytics, passwords, or photos, I keep a copy of everything on my iPhone. If, after I've finished editing, I forget to send Mikah a link to our latest podcast files, I can easily send them from my phone. I can just as easily send off my WiFi password to a friend who's visiting me for the first time. Since iCloud and Dropbox can do most of the work for you, there's no reason to keep information off your mobile devices.
Your phone also has a wealth of data you may not expect; the iPhone keeps track of movement in both a “macro” and “micro” sense. Oh, and if you're creeped out by any of these next features, just know you can always disable them.
Every day, your iPhone tracks your steps and the flights of stairs you've climbed. If you have an Apple Watch, it'll also keeps tabs on your heart rate.
At this point, the information is fairly inconsequential. Eventually, however, there'll be enough information available that illness can be found long before more obvious signs show up.
Open your Home screen and tap the following:
Settings » Privacy » Location Services » System Services » Frequent Locations
You are now looking at a list of everywhere you've visited since you began using your phone. The beautiful part of this is your phone tries to guess where you want to go next based on previous locations. It'll even provide helpful traffic information.
So, while yes, it's a tiny bit creepy, I'm willing to trade a bit of creepiness for a good amount of helpfulness.
3. Take advantage of iOS-only apps.
There are some useful (and totally beautiful) applications on the iPhone that no Android user will ever be able to use. Omnifocus, Reeder, and Overcast are three of my favorites.