[54mf]

This is total speculation, and probably easily explainable by any number of things, but: I bought the iPhone 4 the day it came out, subsidized price. I just called *639# to check my upgrade status, and the message says I'm not eligible for a full upgrade now, but "may qualify on 11/25/2011". That isn't any sort of upgrade anniversary for me - at least, I don't think it is - so that's an interesting date.

[theseanstewart]

Mine says "As a valued customer, we can offer you an upgrade with a new 2-yr commitment and an $18 upgrade fee". I bought my iPhone 4 the day it came out. I'm on a family plan.

[joeminkie]

Sometimes the upgrade date can be moved up if you pay a lot per month because of a larger plan, unlimited sms/data, etc. You pay off your subsidization quicker.

[brianwhitman]

Yes-- i pay $250/mo on my plan (international data & etc) and also bought the iPhone4 subsidized day 1, and my message says I am eligible for an upgrade now.

[54mf]

Ah, that could be it. My girlfriend is on my plan as well, so I'm paying a bit more than your average customer.

[rsynnott]

I doubt it's that significant, as this stuff varies dramatically by telco around the world. 12 months is standard here, for instance, and I believe it's often _3 years_ in Canada.

[ceejayoz]

Mine says 4/21/2012, so I wouldn't read too much into it.

[gonzo]

mine says 03/07/2012

[adolph]

Maybe that is the date other carriers get it?