W910I Unlocking/Flashing

Hello i'm sorry but this has probably been asked a million times, and i have search high and low on the internet but, nothing is too clear on what to do.

I've got a W910i locked to Vodafone
and i would like to unlock it to all networks.
I'm not sure how to do this, do i need to flash it or is there something similar.

I'm from the UK, so any UK based unlocked, or generic unlocks would be great.

A2uploader indentify it as
NETWORK: LOCKED
Service provider: LOCKED

Any help would great thanks!

I flashed it with a generic firmware and generic file system and a generic custompack, but it's still not unlocked.

flashing and unlock are two different things, you need to unlock with Omnius.