You'd most likely still see Android winning. Android outsold the iPhone by a 2:1 ratio last quarter. AT&T has something like 35% of the US customers. I imagine they cover at least 90% of US customers very well (probably only Verizon is better).
It is certainly possible that 25% of all Android users are not getting an iPhone simply because of carrier. I find this really hard to believe though.
It is certainly possible that 25% of all Android users are not getting an iPhone simply because of carrier. I find this really hard to believe though.