Shares of Apple (AAPL -2.51%) are up half a percent as its newest phones, the iPhone 5s and the iPhone 5c, go on sale worldwide today. Million Dollar Portfolio Advisor Ron Gross has heard that sales are pretty strong, especially for the gold iPhone 5s, which has already sold out in some stores. But the most important factor to the continued success of these phones is what's inside them -- the 64-bit chip, specifically. This will set the stage for Apple's new technology down the road, and will hopefully prove that the company still has the ability to innovate. But Ron isn't too worried about Apple proving itself; he sees a lot of upside ahead.