Next week Im hoping to swap my unlocked T-Mobile G1 with an unlocked Vodafone Storm.

I'm aware of as well as making sure its unlocked, that I need to make sure it has been un-provisioned off Voda's BIS service so it can be provisioned on T-Mobile UK BIS service.

And that I have to get BIS enabled on my account (£5pm extra)

for this reason the swap and testing is being done in person (no posting the phone here)

How much success have other UK people had using the Vodafone storm on the other big 3's BIS like O2, Orange and T-Mo UK ?