An article on Forbes.com states that if Apple starts selling the iPhone on Verizon, it could damage the momentum Google has built up for the Android devices.
I’ve said in the past (here and here) that even just a rumor that an iPhone would be available on a particular network could be enough to damage or short-circuit any momentum competing smartphones generate. Obviously, if the iPhone were to be released on a particular network, it would likely dominate that carrier’s smartphone sales while pent-up demand was filled. But the real proof in the pudding would be head-to-head sales after the initial sales surge. Given the power of Apple’s marketing machine right now, it would be hard to predict any outcome other than Apple coming out on top.