Nokia Lumia 800

I would personally say that after 3 months of owning the Lumia 800, it is much better than the iPhone 4S. The style of the phone looks a lot nicer than the iPhone, and the curved screen on the Lumia mean using it is much easier.
The Windows mobile, is also a lot better than the iOS, its easier to use, nicer to use and just feels a lot better all round.
If you are upgrading from an older phone which is past its best, or an iPhone or other phone, the Lumia is the right phone for anyone to use. The fact that it covers almost everything that you could want from a phone means anyone can use it and be happy with its performance.
The phone has a huge app market, with thousands of games, has a lot of social apps, and a ton more apps for everyday use.
The music and video app is quality for music fans. You can also download music for free, and listen to it when you want.
The phone is not the lightest, but it is not heavy in your hand, meaning you can hold it for a long time and be comfy. The long design makes the feel even better as it fits into your hands comfortably.
The camera produces both images and videos which you would think have been taken with a HD camera. They are sharp and look stunning. It is also great for getting action shots as it does not show very much shake.
I would highly recommend this phone to anyone that is looking for an upgrade.