Apple Insider reports that, based on a Piper Jaffray survey:

12% of consumers who visited a retail store this past weekend to make their iPhone 3G S purchase said they were replacing a BlackBerry handset, the latest sign that Apple continues to make headway against rival Research in Motion in the high-stakes smartphone market.

28% of iPhone 3GS said buh-bye to their old carriers and hello to AT&T as well, proving once again just how valuable the iPhone is to new customer acquisition…