Samsung's Focus, is one of the most impressive of the new crop of Windows Phones. It's the slimmest, the brightest and maybe the simplest. The Focus's main selling point is its Super AMOLED screen, which really pops indoors. It's also the only Windows Phone that can expand with memory cards, according to an AT&T spokesman.
All the new Windows Phone 7's work similarly, as they're all based on Qualcomm's 1-GHz QSD8250 chipset with very similar hardware stats, including HSDPA 7.2, Wi-Fi, and a 5-megapixel camera. The Focus has 8GB of memory built in, but an AT&T spokesman at the launch said a MicroSD card up to 32GB could be added, provided you factory reset the phone when you do. If that's true, the Focus can expand up to 40GB.