To think that I was the only person doing this exact trick days ago!
Anyways, I myself have used my single iphone and activated the 3 rest of my UNELIGIBLE lines and they are all now eligible for upgrade. Throughout last night and today though, there were some outages which showed that an upgrade couldnt be done through the online interface.
Before I was checking online for my eligibility, I would call that good ol 611 and check. They kept telling me that the iPhone had to of been purchased and activated prior to May 27th. How could they judge a person that purchased it on that day but didnt activate until a few days/weeks later!??!
All is good now, and I completed the final activation on one of my lines around 9 pm tonight, PST.
Hope this works out for everyone!