How to unlock iphone 4s on vodafone for free?

I need to unlock my phone however its locked to TalkMobile (which is basically vodafone) but they charge ridiculous prices… I heard you can do it yourself for free but how?

There are many scams claiming to be cheap unlocks, but none work.

The *only* way for an iphone to be unlocked is for a service provider request that Apple unlock it.

Apple send an update to the phone via itunes to unlock it.
There's no facility for "unlock codes" or anything like that.

Unlocking via the original provider is usually no more than £10 - 15, if there's a charge at all.
(With many contract phones, unlocking is free).

Edit - Talkmobile apparently charge £20 - info here:
https://discussions.apple.com/...0?tstart=0

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