On Friday, AT&T will add to its GoPhone portfolio the first Windows Phone  Nokia's Lumia 520 (pictured), available for $99.99 without a contract.

This AT&T deal is about the cheapest Windows Phone 8 device on the market, even beating T-Mobile's already inexpensive Lumia 521 by $50. The 4-inch phone boasts a 5-megapixel camera and all the Nokia photography fixins  Cinemagraph, super-wide-angle, and Smart Shoot. But with no annual contract, the Nokia Lumia 520 and its $100 price tag could look very appealing to Windows Phone newbies.

Though AT&T says the device taps into its 4G network, Engadget pointed out that it doesn't provide LTE access, which likely means HSPA+, which is faster than 3G but not quite LTE.

"We are excited to launch the first 4G Windows Phone 8 smartphone in our GoPhone portfolio," Jeff Bradley, senior vice president of devices, said in a statement. "A diverse device ecosystem benefits everyone, and the addition of an affordable Windows device gives our customers yet another choice that fits their needs."

The Lumia 520 comes with global HERE Maps, Drive, and Transit, as well as Nokia Music for streaming unlimited music; Microsoft Office is also built into the phone and can sync with other devices.

Other specs include 512MB of RAM, 8GB of internal memory, and 5GB of storage, as well as up to 64GB of microSD access and 7GB of free SkyDrive storage.

Meanwhile, the Lumia lineup may be expanding this week, as Nokia preps for a "BIG" announcement tomorrow in the U.K.

The device maker tweeted this morning that "Something BIG [is] landing tomorrow," suggesting that fans tune into the company's blog at 9 a.m. U.K. time (4 a.m. Eastern).

"We can't tell you what it is yet," the blog said, revealing only the time and an image of a neon-orange rectangle with the Nokia logo. Online chatter is torn between a 10-inch Lumia tablet and the Nokia Lumia 625  a 4.7-inch "low-end" Windows Phone 8 smartphone.

Nokia isn't letting anything slip before the big announcement, so set your alarm and see for yourself what the Finnish company has up its sleeve.

For more, see PCMag's hands on with the Lumia 520 and the slideshow above.

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