AT&T, the major U.S. phone operator, will launch a Nokia Symbian phone with a Qualcomm chip in the U.S. market, an industry source close to Nokia has told VentureBeat. It’s just the latest in a wide front of attack the giant Finnish company is making on the U.S market.For years now, the world’s largest phone maker Nokia has been in cold decline in the U.S. market. Right now, it seems left with a few trial phones and no serious attempt to distribute here. Nokia has a 5 percent market share in the US, well below its 38 percent global share.Meanwhile, wildly successful new smart mobile phone platforms have launched from the U.S. — including the iPhone and Android — inspiring users with new interfaces and features that now seriously threaten Nokia’s stature as world market leader. These smartphones are showing robust growth, not only in the U.S., but across the world.Nokia has finally admitted its mistake, and is now aggressively pursuing deals to attempt to at least double its market share in the U.S. over the next year. “Mea culpa, mea culpa, ” Mary McDowell, Nokia’s executive vice president and chief development officer, told me last week. After years of ignoring U.S. carriers, upset at their insistence to exert control over phones and customers, Nokia is working closely with Verizon, AT&T and T-Mobile to work with them after all. There was a good story in the New York times about this a few days ago.In the latest sign of that about-face, VentureBeat has heard from sources close to Nokia that the company has agreed even agreed to launch a phone in the U.S. market with AT&T using a Qualcomm chip. While details are slim (the final details are still being negotiated, we here), and the launch date is unknown, this is surprising for a number of reasons. For years, Nokia and the San Diego chip company squabbled over Qualcomm’s ownership of a patent governing the chip that runs on CDMA networks. Nokia and Qualcomm finally declared a truce earlier this year.Now they’ve done more than make up; t