Since I’m on my honeymoon, I told myself, my wife, and Dennis that I wouldn’t be writing much until my return. But I wanted to share an interesting discovery with you now. We’re honeymooning on the Mayan Riviera in Mexico, and of course, we took a couple of iPhones along. So I now have some answers as to whether and how the iPhone works internationally—for AT&T customers. And I also better understand a few things about…