how do i know if i am roaming?

When you are outside of areas included in your plan, you will see a roaming indicator on your phone. This looks different on different phones. Some use the letter "R", some say "Roaming", some display an icon. Your phone user manual will tell you exactly how your phone shows that you are roaming.

When you see the roaming indicator, any calls you make or receive will be charged at the roaming rate. If your plan does not have any roaming minutes you will simply not be able to make or receive the call - no surprises on your bill!