With a new iPhone or two just around the corner, TUAW has been getting the usual flood of "how can I check to see if I'm eligible for an upgrade" emails. At least for those of us in the US on either the AT&T or Verizon networks, that's a fairly easy proposition. Here's how to see if you'll be eligible for an iPhone upgrade.
AT&T
For AT&T users, checking eligibility is drop-dead easy. Open the Phone app on your iPhone, tap in the magic code *639#, and tap the Call button. A message appears telling you that "a message will be sent t
