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solve , please see my post, you may be same problem of me
I think many ppl have this problem.
http://www.spacetimestudios.com/showthread.php?7627-Cannot-buy-platinum

I found the solution, it may be my phone clock setting is not same as the server side that make me cannot do auth.
Same as Windows AD Server cannot Auth. the client side which the clock setting...

I already sent mail to support and waiting them for replay. will it delay for buy platinum?

yes i had verified my PL account through email and 4.1 which is I using that it cannot jailbroken

I am also using IPhone4, same is you case , cannot buy platinum. I think it is 4th gen problem on this game, it make all of 4g cannot buy platinum..

I Buy Platinum already, but I cannot see any credit on my itunes?

Did I re-click Buy Platinum again? Because I click it two times.
I afraid click many time , it will buy it more.

I am using...