Unlocking Nokia 2330

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Hi all, I require a few handsets for our technicians at work. BT Mobile want £85 plus VAT per handset. I've seen the aforementioned Nokia 2330 handsets on PAYG for £30 or so. My question is can I purchase these and unlock them or do I have to go to BT? Alternatively, can I purchase unlocked handsets from anywhere? Have looked on the Internet re unlocking and seems to be inconclusive at the mo.

Regards