Microsoft has launched a 4G-LTE enabled version of its Surface Pro 2, adding ATT data to its flagship hybrid for the first time. Of course, the Surface Pro 2 isnt the only tablet to let you browse the Web and send e-mails over cellular data, with Apples iPad Air being one of its most notable competitors. Microsofts 4G LTE Surface Pro 2 costs $679 and packs 64GB of storage.