I've been trying to set up call divert for my father-in-law's landline, who is coming to stay with us for a while. I have tried forwarding it to his O2 mobile and also to my home landline both of which fail. I've had no luck with customer service either. Except that "I must wait wait up to 7 hours for it to register and work"
Well I've waited and nothing! He is now leaving his own house tomorrow and I still can't get forwarding to work.