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The second-largest U.S. carrier, AT&T Inc. (T - Analyst Report), has extended its mobile content storage facility for smartphones running on Microsoft Corporation’s (MSFT - Analyst Report) Windows Phone8 OS (operating System).

Termed as AT&T Locker, the storage facility is based on the cloud and offers 5GB of back-up space for mobile content. The new application comes with an easy upload feature, which allows AT&T customers to upload images, videos, documents and music files automatically from the Windows Phone to AT&T Locker.

The photos and documents are transferred via AT&T wireless network or Wi-Fi and are stored on the cloud-based facility, in a secured location. Customers can also share their images on social media like Facebook and Twitter directly from AT&T Locker.    

The application is already available for AT&T customers using Apple Inc.’s (AAPL - Analyst Report) iPhone or Google Inc.’s Android-based smartphones. AT&T Locker is available for free to Windows Phone8 customers, with an option to buy additional space for high data users.

Presently, AT&T’s website does not show the Locker option for Windows’ customers. AT&T customers can download the storage application from the Windows phone app store. Navigating the application is also quite easy. Apart from having dedicated pages for images, music and files, users can access the ‘More’ page to set up their own social media sites.

Arch rival, Verizon wireless, has already introduced cloud-based data storage and restoring facility for its Android and iOS customers, with the former having an additional ability to save call logs and messages. However, Verizon offers only 500 MB free storage and charges for additional space.

Such apps will satiate the demand for high data storage capacity of the U.S. customers, who use their smartphones to share and store photos and videos extensively. Additionally, AT&T Locker will be beneficial for customers who are not satisfied with the 7GB of free storage provided by SkyDrive.

Currently, AT&T carries a Zacks Rank #3 (Hold).

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