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AT&T is making several announcements today about their “4G” devices and network expansion. AT&T says it is the only U.S. company committed to delivering 4G using both HSPA+ and LTE technologies – providing a faster and more consistent experience for customers.

AT&T Mobility CEO Ralph de la Vega said Wednesday that it will step up its Long-Term Evolution investment and roll out 4G services in the middle of the year. Meanwhile, AT&T diversified its smartphone lineup and touted new 4G Android devices from Motorola, HTC and Samsung. AT&T says it will launch 20, 4G devices this year with a dozen Android devices on tap in 2011.

  • Motorola Mobility showed off the Atrix 4G (right). CEO Sanjay Jha called it “the world’s most powerful smartphone.” The dual-core Atrix uses a Tegra processor, Android 2.2, and has a dock that allows for desktop Web browsing.
  • HTC CEO Peter Chou also showed off the Inspire 4G, which has the next generation Sense exclusive to AT&T. The Inspire features HTML5 support, a 4.3 inch display and Android 2.2.
  • Samsung Mobile Communications, said its Infuse 4G would offer the largest and thinnest screen.

AT&T’s Chief Marketing Officer David Christopher said it will offer a Motorola’s Honeycomb Android tablet in the second quarter running off its current network. LTE tablets will follow in the summer.

AT&T devices will use both their HSPA+ and LTE network. Their LTE transition will go through 2013, but won’t begin until after the first half of the year.

AT&T CTO John Donavan said combining HSPA+ and LTE results in better hand-offs between services.

Meanwhile, Sprint Nextel, introduced two WiMAX devices –– the HTC EVO Shift 4G with a Qualcomm MSM7630 (800 MHz) processor, and the MiFi 3G/4G Mobile Hotspot by Novatel Wireless that are far cheaper than the devices being sold by its rivals.

The EVO Shift, which sports a slide-out QWERTY keypad, for $149.99 and Mobile Hotspot for $49.99. While the smartphone is set to be launched on Jan. 9, the Hotspot may hit the store shelves on Feb. 27.

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