3 Three Hutchison UK - iPhone 4,4S,5,5C,5S,6,6+ (Clean), Help?

I've iPhone 6+ from Carphone Warehouse Flex GB and want to unlock for all carrier worldwide (sim free).



Do I need to activate before carrier unlock?



If Activated with 3 UK, Can you unlock with this service?



Please advice for cheapest ways to unlocked.



Thanks,

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