pyoung47 wrote:
This is curious.  I have att.  I thought roaming was dead and gone.  Other than intl travel of course.
 AT&T still uses roaming in parts of the US for data.
If you travel in the southwest US using an AT&T iPhone unlimited data plan, you will likely get this message: "Offnet Data Usage Data Alert:  You have used ___MB of data roaming this month, "X" times the amount in Terms & Conditions..." Their data roaming limit is 25MB per month. 
I received this message while traveling in New Mexico - this was far enough north that it was US, not Mexican towers.  They changed the AT&T header on my phone to indicate when I was "Off Network", and it was interesting to see how much of the US is still "Off Network".