Nokia has always made fairly solid products that perform well under most circumstances. I found no gaping or loose components on the Nokia 6720, which didn't really surprise me considering the devices basic candybar design which makes it's build simple to create.
The front side of the device is taken up completely by a 2.2 inch non-touchscreen that offers 16million colors for excellent output, while above that screen there's an ambient light sensor for auto brightness setting (I used it but also played around with manual settings) under that screen users are engaged with the typical number keys found on your standard phone along with two soft keys for quick access to options and exiting your apps.

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Looking at the picture shown above the phone also offers a very nice 5MP camera (Not bad for a mid-range device). The camera as you'll notice also includes an LED flash that fits well with the accented camera lens area on the device. Flipping the device back over to the frontside you'll also notice the secondary VGA video conferencing camera, a nice touch that doesn't do much good for calls in the United States at this time.
Finally the right side includes a volume rocker and shutter key, while the left side includes an outer shell MicroSDHC card slot and a MicroUSB port for data synching. Both the MciroSDHC card slot and MicroUSB card slots share a protective cover which is a great addition for protecting your external memory and data syncing slot.

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Finally the bottom of the device includes Nokia's proprietary charge slot and the 3.5MM headphone jack. Why in the word the 3.5mm port is on the bottom of the device is beyond me. It's annoying that my cable is bent upwards if I'm listing to my device and I want to change my tracks. With that being said the audio sounds great!

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Overall the build factor is good and the device itself has a sleek design that's easy to hold in the hand, especially with the curved bottom portion of the device, while the simplicity of the design is great for users looking for a phone and not a Pocket PC.