AT&T announced Tuesday that its first 4G Long-Term Evolution connectivity devices will hit stores Sunday. The company's USBConnect Momentum 4G and the Mobile Hotspot Elevate 4G -- which will also be available for purchase online -- will provide 5 gigabytes of bandwidth for $50 a month. Customers can add additional capacity at a cost of $10 per gigabyte. AT&T said it will offer service first in Atlanta, Chicago, Dallas, Houston and San Antonio by summer's end, with a plan in place to reach a total of 15 markets before the close of this year.

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