It hasn't happened lately, but in the past when I traveled further north I had to be very careful when near the Canadian border. If the signal jumped to a tower on the other side of the border (regardless that I was still on the US side) it could mean billing trouble. In my experience, if you can prove that you did not cross the border (produce a hotel bill, or a restaurant bill, or something that shows your physical location) the phone company will waive the roaming fee(s).

I've always purchased "national" plans, so I've never had to worry about state-to-state roaming or regional roaming.

nope, I would be unhappy, to say the least, unless I was forewarned.

No. At least not that I know of.

a long time ago. Not with the phone plan we have now. The bill is the same every month, no matter how much data or minutes I use.

I have my phone set not to roam - so it never happens.

My phone never roams.

I knew roaming charges still existed, but I didn't realize people still had trouble with them. I'm lucky that I haven't been in a roaming spot in a long time. Back in the olden days of cell phones though I got whacked a few times.