The Lumia 710 represents Nokia's first Windows Phone 7.5 smartphone in the U.S. Thanks to a fast processor and Windows Phone's attractive and snappy interface, the Lumia 710 is no slouch when you use it, and the phone benefits from solid call quality, decent battery life, and a usable camera.

But is the Lumia 710 capable of making a splash in the crowded U.S. smartphone market, or if it just another forgettable, entry-level device?

The Samsung Focus S is one of the two new Windows Phone 7.5 smartphones for AT&T that succeed last year's Focus that was build around WP7.

Where the original Focus had a strong familiar resemblance to the Samsung Galaxy S running Android, the Focus S is as close to a Windows Phone 7.5 version of the Galaxy S II as one can get.

The Titan is HTC's latest range-topping Windows Phone 7 handset. It certainly lives up to its name, being titanic in size and sporting a huge 4.7-inch display. Couple this with a 1.5GHz processor, an 8 megapixel camera, and the latest version of Windows Phone 7.5 "Mango" and you've got yourself a recipe for one heck of a handset.

Not only is the Titan's display the largest that HTC has put on a phone, but it's also the largest display you'll find on any Windows Phone 7 handset. With its narrow form factor and tricked-out camera, the overall package is certainly worth a look.