A new report suggests that AT&T (T) will be the first U.S. carrier to offer BlackBerry’s (BBRY) new flagship smartphone later this month. According to N4BB, the BlackBerry Z10 will be available on AT&T beginning March 15th. The company was reportedly interested in being the first major carrier to offer the device in the U.S. and is said to have moved up its plans to launch the smartphone, which was previously rumored to be released in late March. BlackBerry and AT&T are expected to face difficulties, however, as Samsung (005930) is scheduled to announce its highly anticipated Galaxy S IV smartphone on March 14th. BGR recently reviewed the BlackBerry Z10 and while we found it to be a capable device, it fell short of other high-end smartphones offered by Apple (AAPL), Samsung and HTC (2498).