They expire in a year. So if you earned 40 rollover minutes in July, next July you will lose 40 is they are still there.Just to clarify, how long do roll over minutes stay available, in other words, is there a time limit as to how long you can sit on top of accumulating minutes?
Depending on how you use the phone, you may find yourself using less minutes as you are now able to communicate via email, as well as voice.Do you really expect to use more voice minutes just because the phone is cooler? I would imagine at first you might but it should taper off to a normal amount. Unless of course it's that much easier and more enjoyable with the iPhone vs you last phone.