Jailbreak UK iPhone 3GS firmware 05.16.08 locked on Three (3)?

Does anyone know how to unlock/jailbreak my iPhone 3GS locked to three (3) in the UK?
The firmware is 05.16.08 and it has the current 6.1.2 update installed!
I have tried a few different things such as sn0wbreeze but still no luck:/

Simple answer don't jaibreak it

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