Australian iphone 4, use in uk. I have an iphone that ive bought and used in australia for 6 months on different networks, ive come to the uk and tried to put a o2 sim card in, but i am getting the message on itunes that it is not not a supported sim card

In australia i bought my iphone 4 (4.3.3) from a guy who had it given to him with his vodaphone post-paid plan as an upgrade, but sold it to me brand new in box. I called vodaphone to unlock it, but they said just put my sim in and it would work fine (because they needed a vodaphone number to unlock it, but they unlock iphones for free anyway so it wouldnt of actually been locked) so i put in an optus sim and everything was perfect. I bought an o2 sim when i arrived to england last week, but it is not working. it says no service when i put in my o2 sim card, and  that it is not supported when i plug it into itunes to activiate. what do i do??

Expanding on what Tim said to make sure it's clear, only the carrier to which the iPhone is locked can authorize unlocking. If Optus is the original carrier, as would seem to be the case, O2 would not be able to unlock it. Only Optus can authorize the unlock, so you'll need to contact them. They say, though, that only the account holder can apply for unlocking, so you might not be able to get it unlocked and will have to work through the person from whom you bought the iPhone.
For more information, see the Optus FAQ on unlocking.
Regards.

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