With its three-inch VGA touch screen, arching slider design, and fast network access, the Xperia X1 is one of the hottest Windows Mobile smartphone. Just showed at the World Mobile legislature extravaganza in Barcelona, the Xperia represents Sony Ericsson’s first hit at a Windows Mobile phone (until now, every of Sony Ericsson’s smartphones has been powered by the Symbian OS).

It’s a quad-band GSM sound (good for making calls on worldwide GSM networks), and it supports 3.5G HSDPA and HSUPA for fast Web surfing, recording streaming, and uploading. Wi-Fi is on board, as substantially as a 3.2-megapixel camera and. Pretty nice, especially presented that AT&T meet announced that it’s most likely to unveil HSUPA in the States.

Of course, the ornament of the X1 is its three-inch WVGA screen—that’s 800 by 480 pixels, compared to 480 by 320 pixels for the iPhone’s 3.5-inch screen. The touch-sensitive screen will feature a program of Xpreria “panels” that’ll provide instant access to Web sites, music, events, and the like; working underneath module be Windows Mobile 6. (It’s still unclear whether the phone will use the professional or pared-down accepted edition of Windows Mobile, but more info are due to rise after today.)