While noting its March numbers indicate continued growth for the iPhone’s marketshare, Canaccord Genuity analyst Mike Walkley (via AllThingsD) said the iPhone is currently outselling “all other smartphones” at both AT&T and Sprint together. He also said Verizon is selling roughly as many iPhones as all Android phones combined:

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“Our March checks indicated the iPhone continues to extend its market share gains…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.”

Canaccord’s month-over-month comparison of the top three selling smartphones on the four biggest carriers shows Samsung’s Galaxy S II right behind the iPhone 4S since December on AT&T and Sprint, and the Galaxy Nexus and Motorola Razr lineup is not far behind on Verizon. The iPhone 4 appears as the No. 3 device on AT&T and Sprint for most months, except for March 2012 when the Galaxy Note displaced iPhone 4 for the third position on AT&T for that month.

The e iPhone accounted for approximately 80.8-percent of the total 9.4 million smartphones AT&T sold during Q4 2011. The company said in January that it activated 7.6 million iPhones during the quarter, beating out 4.2 million iPhones activated on Verizon. According to the latest numbers from Nielsen, approximately 48 percent of smartphone owners are Android users, with approximately a third (32.1-percent) being iPhone users.

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