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Apple devices will already be unlocked. If after trying an alternative SIM and synchronising to itunes the device is still locked speak to the Social Team here: Contact Us
Unfortunately this device is not unlocked, I've tried the sim and it says it's not supported. I cannot access iTunes as it wants two factor aunthntication to the giff gaff number which I am unable to access until it will work in the phone. So any advice on how to do this would be great please.