Apple's latest Watch has built-in cellular service and will retail for $399. The phone number on your watch will be the same as your iPhone. (Sept. 12) AP

CUPERTINO, Calif. —  The newest edition of the Apple Watch answers the concern poised by many consumers since the Watch was first released in 2015: Why does it have to be tethered to the iPhone?

The Series 3 edition, out Sept. 22, will have cellular connectivity, which means that you'll be able to jog, for instance, without having the iPhone in your pocket or attached to your arm as you run. 

But there's a price to wireless. The new watch will start at $399 vs. a new tethered edition for $329. 

And there are monthly wireless charges, even if you have a wireless contract for your phone. (This is similar to how it's done for the iPad.)

To kick it off, the big four wireless carriers are offering monthly services for free for the first three months. After that, it's an additional $10 monthly to use Apple Watch. 

In the keynote presentation here on the new Apple campus, Apple showed how the watch could make calls and receive texts without the iPhone nearby, using the same phone number. 

Apple says both new Watches have a 70% faster dual-core processor and new wireless chip. (But let's be real: When has using the watch been problematic due to slowness?)

The original Series 1 Watch is still available, starting at $249, down from $269, while Series 2 has been discontinued. 

In his presentation, Apple CEO Tim Cook said his product is now the best-selling watch in the world, out-performing brands like Rolex. But as he's done since the watch was announced in 2014, he didn't offer sales numbers. 

Apple said buyers of the new top-of-the-line watch will be able to stream songs from Apple Music as they're out and about. They were able to listen to Apple Music on the watch earlier, but only in areas with Bluetooth or WiFi. 

Additionally, the company unveiled a new color for the watch, ceramic gray, and new bands and watch faces. Additionally, Siri, Apple's often maligned personal digital assistant, can now talk on Series 3 editions. Previously, you could pose a query to Siri, who would answer with a text reply. 

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Follow USA TODAY's Jefferson Graham on Twitter, @jeffersongraham

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