T-Mobile Refer-a-Friend

Apparently one of you has used my Refer-a-Friend link. Thanks! I received an email a few days ago to tell me that my "Promotional Card" is on the way.
A reader contacted me last week to say that he had used my link, but since it takes a couple of months to go through, I think this is from someone else:

I'm not sure if the card will be something like one of those prepaid Visa cards, or something I can use to add credit to my T-Mobile account, or just some stupid marketing junk. Once I receive it and figure out what I can do with it, I will be sure to add a post here on my blog!