Apple introduces a new iPhone model each spring, and the company will most likely do just that Monday morning at its annual World Wide Developers Conference in San Francisco. If you aren’t sure if you can affordably upgrade to the latest and greatest model, AT&T makes it easy to check right from your iPhone.
To check your upgrade eligibility, just dial *639# from your iPhone. AT&T will send you a text within a few minutes detailing how much you’ll pay to move up to the newest iPhone model — excluding the cost of the phone.
AT&T’s upgrade eligibility message
In my case, I’ll be paying US$18 in addition to signing a new two-year contract to move from my iPhone 3G to the new model.
This is a quick and easy way to check your upgrade eligibility, and AT&T doesn’t charge you for the text message.