If I update my unlocked iphone will it lock up again?

I bought an unlocked phone off of a guy who doesn't know the original carrier, it is unlocked to fido. I don't know much about the unlocking system but he told me if I update it on itunes that it will be locked back up. I have a fido sim card in it and hes not sure if its a rogers or fido phone. So apparently if i update it and its a rogers phone it will lock up then I will have to pay money to get it unlocked again.

Check which version is on the iPhone and what's the baseband, this is of course depending on the iPhone, (3g, 3gs, 4, 4s) do some reading at ijailbreak.com searching for unlockable baseband. If the iPhone is jailbroken, it means that the unlock was made with Ultrasn0w. This means that if you update, you will loose the unlock. The only way that you don't loose the unlock when you update is when you factory unlock with iTune, then you can update to the latest version without any worries.

Yes it will.

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