A study done by Consumer Intelligence Research Partners (CIRP) shows that Sprint has 9% of Apple iPhone sales at the Apple Store compared with 19% of iPhone sales at Best Buy. That stat in a vacuum would be meaningless except that both AT&T and Verizon have a slightly higher share of Apple iPhone sales at the Apple Store than they own at Best Buy. According to CIRP's Michael Levin, Sprint suffers at the Apple Store from being "third to the dance." He adds that at "carrier-agnostic" locations like the Apple Store, AT&T's large number of iPhone users dating back to the first launch in 2007, and Verizon's large number of customers, are preventing Sprint from gaining any traction.
The one hope that Sprint has is that as more and more AT&T and Verizon Apple iPhone totin' customers come off contract, they might want to take a look at Sprint's unlimited data plans for the device. Sprint is the only one of the three to offer unlimited data with the Apple iPhone and has been advertising this heavily. But even that might not be enough to get iPhone users to switch. According to CIRP, AT&T and Verizon retain 94% of Apple iPhone users on their respective networks.