Are you getting dropped calls on your iPhone? It's your fault. According to a report in today's New York Times, your iPhone is a data guzzler, and you, like most other iPhone owners, use it a lot. After all, it's the greatest handheld computer ever invented. But iPhone joy comes at a cost: the average iPhone owner uses as much as ten times the network capacity as a typical smartphone user. The result is a lot of angry customers. The article has some interesting anecdotes, including the occasion when thousands of iPhone owners attended a technology conference in Austin — and inadvertently brought the AT&T network to its knees. But don't despair. AT&T is currently spending billions to upgrade its network — an upgrade expected to be complete next year.