The iPhone 4S is the top selling handset at AT&T, Verizon and Sprint, according to new data by the Canaccord Genuity resesarch group — as reported by “InformationWeek” (

Canaccord looked at individual handset sales across the top four wireless network operators in the U.S. between December 2011 and March 2012. The iPhone leads at the three mentioned; it isn’t available at T-Mobile USA.

“Our March checks indicated the iPhone continues to extend its market share gains,” wrote Canaccord Genuity analyst Mike Walkley in a note to clients. “In fact, we believe iPhones are outselling all other smartphones combined at Sprint and AT&T and selling at roughly equal volume to all Android smartphones at Verizon.”