Update: With the cellular Apple Watch 3 available you can now do more than ever without tethering your Watch to your iPhone, but even without Apple's latest wearable there are plenty of phone-free Apple Watch features.
With the arguable exception of the cellular version of the Apple Watch 3, the Apple Watch isn't designed to replace your iPhone just yet. In fact, it depends on it.
Many Apple Watch apps are really just displays for things running on your iPhone, and some key features aren't available if you aren't paired to an iOS device.
For example, the original Watch doesn't have a GPS receiver, so if your phone isn't around you can't track the distance you've travelled beyond measuring steps.
GPS has been included in the Apple Watch 2 and Apple Watch 3, but even they don't have their own cameras, so while you can use them as a viewfinder for your phone they don't have the ability to snap anything by themselves.
That doesn't mean the Apple Watch is a dumb terminal, though. It has its own processor, sensors and on-board storage, and we're increasingly seeing stacks of innovative apps as developers are discovering the possibilities.
Here are the key things you can do with any Apple Watch model, even when there's no iPhone for it to talk to - after the initial setup on the handset is complete that is.
And if you've got an Apple Watch 2 or 3 you'll also find some things that only work on these newer models.
Track your runs
The Apple Watch 2 added a GPS chip to the mix, which means you can finally track your runs without carrying your phone around with you.
You'll be able to see exactly where and how far you've gone, and maybe you'll even run slightly faster without the added weight of your phone.
Track your swims
This is an activity you definitely won't want your phone for, but thanks to its water resistance the Apple Watch 2 and 3 also work as swim trackers.
The swim tracking out of the box is a bit basic, but you can always download a third-party app to add more options, such as the ability to set drill distances.
Take calls and get notifications
This one requires an Apple Watch 3, and the pricier cellular model at that, but it brings the Watch a lot closer to the phone, as you can actually take calls on your wrist with reasonable voice quality.
As you can also get notifications it almost makes the Apple Watch as useful without a phone as with one, but it's still not a full phone replacement.
Many Apple Watch apps now work independently of your phone, meaning you can do the likes of check the weather forecast with Dark Sky, translate spoken words using iTranslate and much more besides.
In some cases you'll need a Wi-Fi connection (or a cellular Apple Watch) to get full app functionality, but any standalone app that works offline will work without your phone wherever you are, and whichever Watch you have.
Pay for stuff
Once you've set up Apple Pay via the Apple Watch app, you'll be able to use the Watch to pay for things in shops.
The app creates a unique token that's stored on the Watch to use as a card number - allowing you use Apple Pay even when you're away from your phone. To pay, simply wave your watch at the Apple Pay-compatible terminal and let the built-in NFC (near-field communication) radio do its thing.
Get on planes or go to the movies
Apple Wallet is on the Apple Watch, so anything already stored in it - aeroplane boarding passes, electronic tickets and anything else scannable - should work just fine without your iPhone.
Sadly, not all firms have embraced this, so we're still often wandering around with pockets and purses full of plastic, but we're gradually seeing more things go digital.
Listen to music, audiobooks or podcasts
The Watch has its own storage space, some of which is available for music - so you can use the Watch's built-in Bluetooth to pair with a pair of wireless headphones and get music on the move.
Naturally you won't be able to stream music from the likes of Spotify or Apple Music without an internet connection, which means being in Wi-Fi range or using an Apple Watch 3 cellular model, but there's more than enough internal storage for a run, a workout or a short commute.
And if you're using Apple Music you can make playlists available offline on your Apple Watch.
One of the smoothest features we saw at the Apple Watch launch event was SPG Keyless, a feature that enables Apple Watch users to unlock Starwood hotel rooms without anything as old-fashioned as a key.
According to Starwood, the keys work via Bluetooth Low Energy and are popped up by the iPhone app as push notifications the day before you check in.
The same idea could of course work with any other kind of Bluetooth-enabled smart lock, so it's possible we'll see Apple Watch-compatible locks for your home, garage or gym locker.
Track your fitness
The Apple Watch doesn't need to be paired with your phone to monitor your heart rate or workout: it can store that data and sync it to the Health app when you get back from your run, cycle or trip to the gym. There are also various third-party fitness apps available, such as Strava.
Control your Apple TV
Apple's Remote app has been ported to the Watch, and like its iOS sibling it enables you to control your Apple TV via the magic of wireless radio.
You can also use it to control iTunes on your computer.
Do watch things
Hardly a surprise, this, but time-related functions such as the alarm, stopwatch and timer don't need a phone to function.
What iPhone-free features do you think we'll see from app developers? Let us know in the comments.