Had the same issue with my SIM card while I was a student. Still registered as living at my parents' thirteen hours away, and they insisted on sending my new sim there while they were gone for weeks.. Luckily I'm from a really small town so got the mailman to just repost it with correct address. Pretty illegal I guess, though.

Another comment here about invalid card number also reminds me about my passport. I have a Danish passport but never lived there, so my id number has X-es in it in instead of all numerical. That's pretty hard for various form validators to accept..