Hello all. I've got 3 mobiles on my account with family option. They are now beyond the 12 month contract so are portable. My parents have managed to sign themselves up for the Halo 1 option (much more than they need - cheers BT). Therefore I'm thinking that in return I'll transfer the mobiles off my account and onto theirs, in order to get the double data. Has anyone else done a BT to BT transfer? Any restrictions on this approach?