I'm an apple user and have used iPhones in the past but have switched to HTC and now on their second generation phone. Unless things change with the next iPhone, I may have bought my last one. Very happy android user.
There is ABSOLUTELY no evidence that these devices interfere with nav or comm equipment. The rationale was that since the FAA didn't know, they didn't want to take a chance. Yep, sounds scientific and engineering practice.
Technologically, the iPhones are failing behind but thanks to poor marketing on the part of Android and the market fractionation of manufacturers, Apple has been spared - for the moment. Life cycles happen and it will happen to Apple as well.