S3 for 4S 16GB..or 4S 64GB..read more inside :)

I have for trade

Samsung Galaxy S3
Vodafone Network
64 GB Micro SD
Pristine Condition
With box/accessories

-

I have been offered one of two deals.

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Deal 1

iPhone 4s 16GB
Vodafone Network
Pristine Condition
With box/accessories

-

Deal 2

iPhone 4s 64GB
3 Network
Pristine Condition
With box/accessories.

Obviously I would much prefer to take Deal 2, however it is on the wrong network! Anybody know if I can unlock the 4s on 3 (UK) network at all? I wouldn't mind paying for a quick fix so I can trade for a 64GB model rather than the 16GB.

Cheers!