Pdp failure iphone 4

i have just had my phone unlocked, i put the new sim in and it keeps saying PDP failure. not sure what this means;

So, nobody has any ideas?
Since posting the above I have connected my iPhone to iTunes and no carrier update was forthcoming. The problem still exists.
Is there anything I haven't tried?

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    Message was edited by: modular747

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    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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    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.
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    Message was edited by: modular747

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