Landing page (I have no Windows phone):

The price is in US$ only - you may want to consider adding other currencies, perhaps even with a GeoIP lookup.

Blatant typo in "full fearuted trial".

Phone image looks like it was scaled up from a lower resolution, better find a high-res image.

I find the image browsing controls (dots at the bottom) a bit awkward and non-obvious.

You may want to consider removing the AT&T and Samsung marks, that spells legal trouble if the wrong person looks at your page, especially since you're not acknowledging them.