Newest data from comScore’s mobile subscriber report shows: Not the iPhone but Research in Motion (RIM) is the leading mobile smartphone platform in the U.S. with 43% share of U.S. smartphone subscribers, while Apple ranked second with 25.1% share, followed by Microsoft at 15.7%, Google at 7.1% and Palm at 5.7%. Google’s Android platform continues to see rapid gains in market share.

How is RIM doing it? Silicon Alley Insider: “It started by being very popular with businesses, and it gradually shifted its focus to consumers. Verizon, the top U.S. carrier, has been promoting the heck out of it, including several buy-one, get-one promotions. And generally lower prices have made the BlackBerry Curve and Pearl very popular phones among mobile Web users and also people who just want a phone that’s good for text messaging.”