Verizon and AT&T are testing an LTE Nokia Lumia 800 variant, according to reports.

The device is likely to be named the Lumia 900 and will reportedly look similar to the existing Lumia 800 device. CNET News.com reports that Nokia is testing the device with Verizon and AT&T. The Lumia 900, Nokia’s next high-end device, will reportedly feature a 1.4GHz processor, 4.3-inch ClearBlack AMOLED display and an 8-megapixel camera. Recent reports suggest that the device will launch shortly after CES 2012 in January. Nokia is also preparing a huge marketing blitz in the U.S. to accompany the launch of the new device. The persistent rumor of a 4-inch Lumia device seems to follow previously speculation on a “Ace” Nokia device. A new Lumia device showed up by mistake in a Nokia developer video earlier last month, it’s not known whether this device was concept or a future model.

Nokia is understood to be preparing its U.S. Windows Phones for an announcement at the Consumer Electronics Show in early 2012. The Finnish handset maker is working with AT&T to launch its Nokia Lumia Windows Phone at CES 2012. Microsoft is planning to support Nokia’s re-entry into the U.S. market with a large presence at CES 2012. Sources familiar with Microsoft’s plans have indicated to WinRumors that Nokia is in talks with several U.S. carriers to provide an LTE compatible handset as its first U.S. Windows Phone device. AT&T is expected to be the primary launch partner of any Nokia Windows Phone devices in the United States. Nokia could also announce any plans it has with Verizon at CES, if the network decides to adopt a new Nokia Windows Phone.

Windows Phone “Tango” is also set to feature on Nokia’s U.S. device. The update is believed to be an interim release between Windows Phone 7.5 “Mango” and the next-generation of Windows Phone, currently codenamed “Apollo.” Windows Phone build 7.10.8200 was recently discovered in server side logs of a Windows Phone application. A screenshot, believed to be a Tango build, also leaked and demonstrated a new device search feature for Windows Phones. Microsoft’s chasis 2 specifications (Tango) will also include a 480×320 BlackBerry style design and LTE support. The software giant is expected to ship Windows Phone “Apollo” with 1280×720 resolution and dual core CPU support.