The bolded is false. I have polarized sunglasses and can read the iphones' display without a problem.
Actually it's quite true. http://www.maclife.com/article/news/displaymate_takes_gadgets_and_polarized_sunglasses
The iphone screens look horrible with polarized sunglasses. I believe it's endemic to most if not all LCD screens.
Edit: further researching this I see that the ip6 has a new polarizer which doesn't have issues with polarized sunglasses, although I haven't tested it myself and still remain skeptical. But for now I'll have to retract this issues with ip6's, although it still remains more than valid on the previous generations.