Data SIM cards for overseas travel: good (b-mobile) and awful (Rebelfone)

In June, we were in Greece for two weeks and Austria for one.
WIND in Greece was ~ $12 for 2GB for a month, and worked perfectly.
Orange in Austria was ~$13 for 3GB for a month, and also worked pretty flawlessly, but with one hiccup I wanted to pass on to travelers.

Orange required a credit card to get the SIM. (WIND required registration, but was fine with cash)
What I had forgotten from the last time I activated 3G with AT&T back home was that it auto renews. It’s rather difficult to cancel the auto renewal when you’re back home and don’t have access to the Orange network on your iPad.
I wouldn’t have even know except that I saw the charge and then received an email, in German, from Orange and ran it through Google Translate.

They required the sim card number to cancel the auto renewal, so it was lucky I had kept mine as a souvenir. If I hadn’t, I would have just had to put a stop on the credit card. As it was, they successfully got an extra month’s fees.

So Pro tip: If you’re getting 3G service in another country, don’t forget to cancel it before you leave that country. Also, hang on to the paperwork and the card the sim was punched from.