Microsoft has begun taking pre-orders for the AT&T and T-Mobile Nokia Lumia 635. The budget smartphone is one of the first Windows Phone smartphones to ship with Windows Phone 8.1.

Nokia's entry-level Lumia 520/521 has been the most successful Windows Phone smartphone. The budget handset is offered pre-paid from carriers like T-Mobile and AT&T in the U.S. The handset can be purchased for well below $100 and offers users a Windows Phone smartphone that offers some impressive specs and features at a very affordable price and no contract.

The smartphone can also be upgraded to the upcoming Windows Phone 8.1 OS; we created a guide in case you're looking to try out Windows Phone 8.1 on your current Windows Phone 8 smartphone.

If you were interested in what is sure to be another big hit for Nokia, the Microsoft Store is now taking pre-orders for the T-Mobile and AT&T Nokia Lumia 635. Microsoft hasn't revealed just when those pre-orders will ship, but considering Windows Phone 8.1 is expected to be released in the coming weeks, an official launch can't be far off.

The Nokia Lumia 635 features a 4.5-inch 480 x 854 Gorilla Glass 3 ClearBlack display with a pixel density of  218 pixels per inch (ppi). It's powered by a 1.2 GHz quad-core Qualcomm Snapdragon 400 processor, Adreno 305 GPU (graphics processing unit), and 512 MB of RAM. It has 8 GB of internal storage.

The Nokia Lumia 635's camera capabilities include a 5-megapixel rear camera that can record 720p HD video. Its removable 1830 mAh battery will provide up to 14 hours of talk time and up to 648 hours of standby time. The  dimensions of the 635 are 129.5 x 66.7 x 9.2 mm, 78.5 cc (5.10 x 2.63 x 0.36 in) and it weighs 134 g (4.73 oz).

The Nokia Lumia 635 also benefits from having a 4G LTE radio, which will allow users to access AT&T and T-Mobile's 4G networks.

Interested customers can pre-order the no-contract AT&T Nokia Lumia 635 from Microsoft for $99, while the T-Mobile Nokia Lumia 635 is priced a little higher at $129. We'll keep you updated once we hear any information on an expected ship date.

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