ERROR: Could not activate cellular data network: PDP authentication failure

I have an iPhone 3g that was given to me by a friend a couple months ago. Before I got the phone i was on a plan with Softbank in japan with another cell phone. When i got the iphone i unlocked it so that i could use my old sim card with the iphone. everything worked out fine, i was unable to use the internet via 3g since it wasnt on my plan but i could text and make calls with no problem.
Everything was working fine until yesterday when i started getting this error message: "Could not activate cellular data network: PDP authentication failure"
once this happened i could no longer text or make calls. my iphone recognizes the sim card, shows one bar of signal, the network, and the 3g symbol. i have also rebooted, restored, reset network settings, and talked with Softbank; all had no help.
i have no idea how to fix it, any suggestions would be awesome.
thanks.

All iPhones sold in Japan are sold carrier locked and cannot be officially unlocked by the carrier. If you unlocked it, it was by unauthorized means (hacked), and support cannot be given to you in this forum.
Hacked iPhones are subject to countermeasures by Apple, particularly when updating the firmware. It is likely permanently re-locked or permanently disabled.
Message was edited by: modular747

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