The rumour floating the net waves is that Sony Ericsson is gearing up to push out new versions of their Sony Ericsson XPERIA X10 smartphone that will run on the AT&T network and the T-Mobile network according to a report on android guys.

Apparently a list of specs leaked out of Sony Ericsson that shows two new versions of the Sony Ericsson XPERIA X10 destined for the United States market.

One of the XERIA X10’s will sport the wireless frequency for AT&T’s HSPA quad-band 800/850/1900/2100, and the second will support the T-Mobile USA frequency tri-band 3G 900/1700/2100.

Both US Sony Ericsson XPERIA X10’s will also support quad-band GSM/GPRS 850/900/1800/1900, thus the rumour is that either or both of these US carriers will gain the Sony Ericsson XPERIA X10 although there has been no official confirmation of this.