This here is Alcatel's brand new flagship smartphone, the Idol 4S.

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As well as some surprisingly slick style, this phone packs a 5.5-inch display with a 2,560x1,440-pixel resolution, an octa-core processor -- and some sneaky tricks up its sleeve.

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It's on the side of the phone that things get interesting. You'll find a silver button, called the "boom key", which can be programmed to do what you want.

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You can set the key to launch the camera, to take photos, or to launch a pre-set app.

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Set it to launch Instagram in an instant if you want to make sure you can post images of your food before it goes cold.

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The North American version of the 4S gets a fingerprint scanner on the back.

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It's made from glass and metal, which gives it a classy look not far removed from Samsung's Galaxy S6.

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The phone uses a Micro-USB port for charging.

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There's also a 16-megapixel camera.

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Grab the phone any which way and the screens will flip around so both ways are "up".

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There are identical speaker grilles on the bottom and top.

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Alcatel's sub-brand "Idol" is prominent on the back.

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It's running the latest Android 6.0 Marshmallow software.

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The boom key is not the lock screen button!

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In the settings, you can turn on the reversible OS.

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There's an 8-megapixel camera on the front, as well as a pair of front-firing stereo speakers.

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The Idol comes with a virtual reality viewer in the box. Slot your phone inside and hold it up to your face like Luke here and you can watch VR-specific videos, including those cool 360-degree videos that keep cropping up on Facebook and YouTube.

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The power button is on the left-hand edge, along with a microSD card slot.

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The camera interface is simple and straightforward to use.

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We like the metal edge to the phone.

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The Idol 4S has a smaller sibling, the Idol 4, which we first saw at Mobile World Congress in February. It has a smaller 5.2-inch display with a full HD (1,920x1,080-pixel) resolution.

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It, too, has the same front-facing speakers as the 4S.

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And a glossy back, complete with infuriating ugly sticker.

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The camera is 12 megapixels, but the front camera remains at 8 megapixels.

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Both phones have Micro-USB ports on the bottom, rather than the new USB Type-C.

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At 7mm (0.28 inches) thick, both phones are very slender.

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The Idol 4 has the same boom key to quickly open your choice of app.

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You too could look this cool. Check out more about the phone in our hands-on preview.

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Alcatel's name is printed prominently on the back.

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