I haven't seen anyone post that only 0.55% of people who bought an iPhone 4 called AppleCare complaining about reception issues. Three million people bought iPhone 4s. That's 16,500 people called AppleCare complaining. That doesn't include people who called AT&T or went straight to their Apple Store. I've never called AppleCare for a device I just purchased, simply because if it's DOA I take it back to the store, or file an issue report.
The statistic Steve should have given was the percent of people who called AppleCare about the reception issue out of how many people call about an issue with the iPhone 4.
The statistic Steve should have given was the percent of people who called AppleCare about the reception issue out of how many people call about an issue with the iPhone 4.