Have just upgraded to a sim only deal and chose Cafeyn option for my 'extra'. When I try to redeem, I'm prompted to activate the Cafeyn account through Facebook account (which I don't have) or through email and password. Presumably this is the password from my 'My O2' account as I don't yet have one for Cafeyn. I have tried several times, and I know the password is correct as I used it to access the My O2 account earlier today, but apparently it's invalid, and there's no 'forgot password' option. I'm pretty confused, to be honest!