Dude all s2 are xt compatible
Not in my experience, we (at dse) sold two variants, one that was not XT compatible and we accidently sold the wrong type to a customer and Samsung themselves confirmed to this customer that her variant of the S2 was not XT compatible.
just because it has the 850 band doesn't mean it will work, XT tested the initial range of Xperia phones in NZ and they weren't compatible with their network despite being quad band.
I'm sorry but that's wrong. The i9100 sold by VF and 2D and the i9100T sold by Telecom were the only S2's sold in NZ. Both work perfectly fine on XT (having owned both). The T model varied only in that it had to meet different emissions standards in Australia and had modem firmware optimised for 850MHz networks.
The scenario you describe applies exactly to the Galaxy S not the S2. The i9000T supported 850MHz while the i9000 did not. So a Galaxy S for VF would not work on XT.
I don't see how I'm wrong when both Samsung and our repair service confirmed that her s2 was not compatible with the XT network and we refunded her.
Their are many variants of the S2 out their in the world? Who are you to vouch for every single variant to work on a network that is by no means a standard network. You do not know who we buy our S2's off so you cant stipulate as to its variant,
So I am not wrong you just don't agree with my statement based on the information you have with you. Unless you are a Samsung employee please hold your blanket statements
Edit: we have our own parallel importer that sources phones through our Autralian office.