Maybe you have your favorite iPhone app, the one you turn to at every opportunity. I've become partial to the Fitness app in recent years myself, and Maps is always one of my go-to applications for looking up locations, plotting out trips and, yes, even getting directions. I'm sure you can rattle off your favorites, too.

But whatever apps each of us appreciate, there's no debate as to which built-in app people use on the iPhone the most. That would be Messages, the built-in texting option, which Apple has told me is the most popular of its stable of iPhone apps. And considering it's the primary way most of us communicate with one another — unless you're an oldster like me, you're far more likely to message someone than send them an email or give them a call — I'm willing to take Apple's w

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