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Nokia Lumia 800Even before Microsoft officially adds support for LTE 4G in its Windows Phone platform, Nokia already has LTE-equipped versions of its flagship Lumia 800 smartphones in major US carriers’ hands.

Both AT&T and Verizon Wireless are testing out 4G Lumia 800’s in their labs, reports CNet’s Roger Cheng. Carriers are usually among the first to get their hands on new phone hardware, since extensive testing is required to make sure phones operate properly within their networks.

If true, Nokia is getting a major head start on the Lumia 800’s approval process. Microsoft has been vague about when Windows Phone would support LTE technology, but it’s something carriers desperately want with new hardware since 4G is all the rage. Nokia, too, hasn’t said specifically when the Lumia 800 would be available in the U.S., even though it’s already available in Europe. (Nokia’s lower-end Lumia 710 is expected to land on T-Mobile this week.)

As I’ve recently argued, the Lumia 800 is an incredibly important device for both Microsoft and Nokia, so it behooves them to make sure America’s biggest carriers are interested in supporting the phone. AT&T half-heartedly promoted a Nokia Symbian device two years ago, but that didn’t help sales much. And Verizon hasn’t worked together with Nokia since the Finnish phone maker gave up on making devices that support its 3G CDMA network.

According to CNet’s sources, AT&T is, at the moment, the most interested in working together with Nokia. That falls in line with a report from The Verge last month, which said that AT&T is considering an LTE version of the Lumia 800.

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