Can I get a XDA 11S and sell it on?

[palostick]

I've had two contracts with orange for 10 years and now am thinking of switching to O2 to get a deal on two xda11s. (orange won't match it)

Deal is I sign up for two 02 200 contracts and I get 2 XDA11s for £50 each.

3 questions:

1/ Is there anything to stop me keeping one and selling the other one on ebay?

2/ Would will it be worth getting it unlocked first and

3/ if I do (via an internet site etc) would it raise any red flags with o2.

thanks,

Palostick