The beast in question I believe is a 7510. I know how to do the "master radio reset" if that's what you mean.
I'll check with the service provider (Nextel) but I tend to think it's okay at their end, because every blackberry we have has the same options under our corporate account. So I don't know why it would stop one day. OF COUSE THIS DOESN'T MEAN IT DIDN'T HAPPEN!
I was going to troubleshoot more today but the "end user" forgot to bring his USB cable, so he can't connect it to his laptop. I'm gonna collect suggestions and call him tomorrow to resolve hopefully.