This past Friday we let you know that Sony Ericsson‘s XPERIA X10 handset was rumored to go on sale, unlocked, for upwards of $850. Of course, if a carrier were to announce the XPERIA X10′s availability we would see that price decrease dramatically due to subsidizing.

Anyways, Phandroid has recently noticed that the device’s listing on Sony Ericsson’s website has let us know that it will have UMTS HSPA 800/850/1900/2100.  What does this mean? Well, that it’ll feature AT&T’s 3G, of course.

Now we’ll just have to wait until AT&T or Sony Ericsson make an official announcement.

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