Some of us are a tad absent minded and may forget the exact date when an add-on expires. Since you are always sending unwanted texts about home phone etc. I just assumed I would be advised when my US Roaming add-on was set to expire. I was not. As a result I got dinged for an extra $5 for data use (fortunately the same day I found $5 in an old sock, so I'm even). Still a warning would be nice and certainly not difficult to implement.