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A closer look at AT&T's Asus PadFone X phone-plus-tablet with VoLTE, Android 4.4

CNET checks out Asus' high-performing phone-plus-tablet combo, which will make its way to the US though AT&T.

Now playing: Watch this: Asus PadFone X is a phone-tablet hybrid

LAS VEGAS -- An update to the best phone-to-tablet transformer series we've seen is landing exclusively at AT&T in Q2 of 2014. That makes the Asus PadFone X the first of this line to come to a US carrier.

We're no strangers to Asus' PadFones. Thanks to the addition of Android 4.4 KitKat and Voice over LTE (VoLTE), which will support voice calls over the data network, this carrier-branded version is an even more promising performer than its cousin, the Asus PadFone (September 2013).

Apart from OS and this carrier partner, the specs we know of so far are very similar to September's unlocked, global model. A 5-inch 1080p HD smartphone slides into a connector bay on the back of the tablet docking shell. The phone sports a 2,300mAh non-removable battery and Qualcomm Snapdragon 800 processor, which the tablet will use for its own processing power. The pad will come with its own 4,990mAh battery, however.

Interestingly, the tablet portion of the PadFone is smaller this time around, just a 9-inch HD screen (with a 1,920x1,200-pixel resolution) rather than the 10.1 inches before. That'll place the PadFone X on the larger end of the tablet scale compared to small-size devices like Nexus 7 and iPad Mini tablets.

This isn't the first time that AT&T has peddled a phone-and-dock solution. It also carried the Motorola Atrix 4G docking station along with the Atrix smartphone as an expensive add-on, no doubt a costly mistake for everyone involved.

Asus PadFone X (AT&T logo)
AT&T will carry the Asus PadFone X by Q2 of this year. Josh Miller/CNET

While Asus informed us that we couldn't put our hands on the devices per AT&T's request, we were able to take a good look at the black matte version of the PadFone X (a black glossy version will be sold too).

The smartphone had a crisp, bright screen, and sported metallic trimmings on its sides. As for the tablet, it featured dual front-facing speakers, which is ideal for media viewing. Both the devices looked to have pretty solid build quality, but of course, we won't know for sure until we get a review unit in our offices.

The PadFone X's eventual success or failure on AT&T will come down to price and if buying the one-two combo makes financial sense for those who are also interested in a tablet form factor for travel or home.

Check out more of CNET's CES 2014 coverage.

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