Think about that for a second. Apple defined the modern smartphone market with the iPhone. It then faced an onslaught of competition from Google, Microsoft, Palm, and Research In Motion. Despite their various efforts to dethrone the iPhone, Apple has managed to stay on top. This is evident by the fact that since 2008 Apple has never had to slash its prices.
With all the competition, and pressure from carriers, if Apple was losing the smartphone battle, you'd expect it to cut the price of the phone. Instead, it's been steady.