When you sign up for a contract, you have to provide a pin number; which cant be your bday, or any four identical digits. Since this is tied to the contract you signed (and assumedly, the contract which you are still using when you put the phone up for sale as a white-rom on Yahoo auctions etc), i guess this is left out of the sale...
However, it seems this might also be a defect in the 003/005SH phones.
Lots of people complaining about it on the 2CH boards, not accepting the password they supplied. Apparently most have to take it to the Softbank store, who do a bunch of things to get it reset (apparently takes up to an hour).
I think that other than some hacking like what Disastorm said, it may be that you are SOL
alright when i have enough time ill try to make a litteraly step by step walkthrough on how to change the Google account for the 003sh via hacking with ADB.
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