Nothing changed to my overall mrc and I didn't have any credits. Here's exactly what happened, and I'm sure it affected the discount, but I completely disagree and don't think it's right. I had two lines eligible for an upgrade. One of my lines had the additional discount of $50. The line that had the additional discount had an iphone 3g on it. It's my wife's line and she wanted to upgrade to the iphone 4. We knew that the additional discount wouldn't apply to the iphone, so we used our other line that was eligible for a standard upgrade to get the iphone, then moved the iphone 4 over to the line that had the 3g on it. The rep in the store that performed the upgrade knew what we were doing and actually performed the upgrade and traded lines for us. Not a single feature changed, so I don't see why the discount was removed.