Following last week’s CTIA Wireless conference, all of the major U.S. carriers are now preparing for high-end handset launches next month.

AT&T is expected to sell Research In Motion’s BlackBerry Bold.  There are also reports that AT&T will sell a phone running the new Google Android software, on the heels of T-Mobile’s version, which could be announced as soon as next week.  T-Mobile is also getting the first BlackBerry flip-phone.

Meanwhile, Sprint Nextel is said to be preparing the Samsung Omnia for U.S. customers, while Verizon is reportedly getting the BlackBerry Storm, also widely cited as the Thunder.  That phone is the first BlackBerry with a touchscreen.

Sony Ericsson’s Xperia X1 phone is also due this fall, although its U.S. carriers are not known.