A new video posted by AT&T on its YouTube account, to offer details about the forthcoming HTC One handset, has revealed that the carrier will exclusively have the 64GB version of the handset available for its subscribers.

The promotional video which AT&T has released for the HTC One handset hints that when the handset hits the US markets, the AT&T subscribers will be the only customers who will be able to purchase the 64GB version of the device, since the mentioned version will be exclusive to AT&T and will not be available on other leading US carriers like Sprint and T-Mobile.

Though it is highly likely that the other carriers may also get the HTC One 64GB model later on, there currently is no official confirmation about whether AT&T's exclusivity on the 64GB version will be long-term or only for a few months.

Meanwhile, other than its US exclusive on the 64GB HTC one, AT&T also revealed in the video that it will be offering the device's silver and black versions, the Glacier Silver and the Stealth Black respectively.

In addition, AT&T has also showed off a pair of accessories - the HTC Double Flip Case and the Morphie Juice Pack - which it will be selling alongside the HTC One handset. While the Double Flip Case will facilitate hands-free viewing by doubling as a stand; the Morphie Juice Pack can double as a case as well as an extended battery pack for heavy users.