Will I be able to Upgrade on the first of June (AT&T)?

To an iPhone?
The upgrade is set for the 23rd, However the guy at the store a couple weeks back told us that we could upgrade a line any time of the month its eligible.
My dad doesn't think that.
But is it possible? Is this forum, http://forums.att.com/...-p/3138161, correct?

Added (1). @Cody
Ha ha me getting the Galaxy is irrelevant to loving you, as many people have already suggested it xD
I don't want an android, my mom has the 3 and i'm not satisfied.

If he says so than I'm gonna go with that. Than yes.
P.S. Get the galaxy 4. You will love me and the phone.