Top Windows Phones 

 HTC Windows Phone 8X vs Nokia Lumia 920

 HTC Windows Phone 8X vs Nokia Lumia 920

MISC	SAR US	0.78 W/kg (head)     0.75 W/kg (body)	1.08 W/kg (head)     0.91 W/kg (body)
	SAR EU		0.70 W/kg (head)
	Price group

Nokia Lumia 810  vs Nokia Lumia 822

 Nokia Lumia 810  vs Nokia Lumia 822

MISC	SAR US	1.30 W/kg (head)     0.85 W/kg (body)	0.79 W/kg (head)
	SAR EU	0.83 W/kg (head)	1.23 W/kg (head)     1.03 W/kg (body)
	Price group

Information about  Windows

 Windows Phone is a series of proprietary mobile operating systems developed by Microsoft, and is the successor to its Windows Mobile platform, although incompatible with it. Unlike its predecessor, it is primarily aimed at the consumer market rather than the enterprise market. It was first launched in October 2010, with a release in Asia following in early 2011.

The latest release of Windows Phone is Windows Phone 8, which has been available to consumers since October 29, 2012. Microsoft also has a new version, Windows Phone Apollo Plus, in the works.  With Windows Phone, Microsoft created a new user interface, featuring its design language called the Modern design language. Additionally, the software is integrated with third party services and Microsoft services, and sets minimum requirements for the hardware on which it runs.

Work on a major Windows Mobile update may have begun as early as 2004 under the codename "Photon", but work moved slowly and the project was ultimately cancelled. In 2008, Microsoft reorganized the Windows Mobile group and started work on a new mobile operating system. The product was to be released in 2009 as Windows Phone, but several delays prompted Microsoft to develop Windows Mobile 6.5 as an interim release.

Windows Phone was developed quickly. One result was that the new OS would not be compatible with Windows Mobile applications. Larry Lieberman, senior product manager for Microsoft's Mobile Developer Experience, told eWeek: "If we'd had more time and resources, we may have been able to do something in terms of backward compatibility." Lieberman said that Microsoft was attempting to look at the mobile phone market in a new way, with the end user in mind as well as the enterprise network. Terry Myerson, corporate VP of Windows Phone engineering, said, "With the move to capacitive touch screens, away from the stylus, and the moves to some of the hardware choices we made for the Windows Phone 7 experience, we had to break application compatibility with Windows Mobile 6.5."

Windows Phone 7 was announced at Mobile World Congress in Barcelona, Spain, on February 15, 2010, and released publicly on November 8, 2010 in the United States.

Microsoft released an updated version of Windows Phone 7, Mango (also referred to as Windows Phone 7.5), in May 2011. The update included a mobile version of Internet Explorer 9 that supports the same web standards and graphical capability as the desktop version, multi-tasking of third-party apps, Twitter integration for the People Hub, and Windows Live SkyDrive access.

A minor update released in 2012 known as "Tango", along with other bug fixes, lowered the hardware requirements to allow for devices with 800 MHz CPUs and 256 MB of RAM to run Windows Phone.

In January 2013, Windows Phone 7.8 was released. It added some features from Windows Phone 8, such as an updated start screen, doubling of the color scheme options to 20 and the option to have the Bing image of the day as the lock screen wallpaper. Windows Phone 7.8 was intended to prolong the life of older Windows Phone 7 devices, as these were not upgradable to Windows Phone 8 due to hardware limitations. However, not all users have received the Windows Phone 7.8 update yet.

Microsoft has announced that Windows Phone 7.8 will see further future updates and as both Windows Phone 7 and Windows Phone 8 will coexist for some time, to support devices in different price ranges.

On October 29, 2012, Microsoft released Windows Phone 8, a new generation of the operating system. Windows Phone 8 replaces its previously Windows CE-based architecture with one based on the Windows NT kernel with many components shared with Windows 8, allowing applications to be easily ported between the two platforms.

Windows Phone 8, while adding a number of software improvements, also brought support for updated hardware. This included support for multi-core processors and high resolution screens. Windows Phone 7 and 7.5 were often criticized for a lack of high end hardware support, but Windows Phone 8's new hardware gave Windows Phone the ability to better compete with Google and Apple smartphones. On February 11, 2011, at a press event in London, Microsoft CEO Steve Ballmer and Nokia CEO Stephen Elop announced a partnership between their companies in which Windows Phone would become the primary smartphone operating-system for Nokia, replacing Symbian. The event focused largely on setting up "a new global mobile ecosystem", suggesting competition with Android and iOS with the words "It is now a three horse race". Elop's reasoning behind settling on Windows Phone over Android involved the realization: "the single most important word is 'differentiation'. Entering the Android environment late, we knew we would have a hard time differentiating." While Nokia would have had more long-term creative control with Android (note that MeeGo as used by Nokia resembles Android more than it does Windows Phone 7), Elop enjoyed familiarity with his past company where he had been a top executive.

The pair announced integration of Microsoft services with Nokia's own services; specifically:

The partnership involves "funds changing hands for royalties, marketing and ad-revenue sharing", which Microsoft later announced as "measured in billions of dollars."Jo Harlow, whom Elop tapped to run Nokia's smartphone business, rearranged her team to match the structure led by Microsoft's VP of Windows Phone, Terry Myerson. Myerson was quoted as saying "I can trust her with what she tells me. She uses that same direct and genuine communication to motivate her team."

The first Nokia Windows phones, the Lumia 800 and Lumia 710, were announced in October 2011 at Nokia World 2011 event.

At the Consumer Electronics Show in 2012 Nokia announced the Lumia 900, featuring a 4.3-inch AMOLED ClearBlack display, a 1.4 GHz processor and 16 GB of storage.[31] The Lumia 900 was one of the first Windows Phones to support LTE and was released on AT&T on April 8.[32] An international version will launch in Q2 2012, with a UK launch expected in May.[33] The Lumia 610 is the first Nokia Windows Phone to run the Tango Variant (Windows Phone 7.5 Refresh) and is aimed at emerging markets.

Despite the partnership with Nokia, Microsoft has promoted HTC's Windows Phone 8X as the flagship device for Windows Phone 8 during the 2012 holiday season, instead of the Nokia Lumia 920.