Eligible for an upgrade with AT&T, fianc? on same plan upgraded with no problem at apple.com. Went to upgrade my line on the apple online store, got through the whole process and then came to a screen with this message. However, I am able to order through the AT&T website, just didn't want to wait so long to receive my iPhone Plus. Talked to reps and went to store, they said something about a cross market incompatibility, and that I should just order through AT&T, which I did (now will commence month of waiting). Anyone else know anything about this? Or have this problem?