I've been having the same issue since I moved to Sky mobile some time ago - I cannot phone my BT home phone number.
I've been passed backwards and forwards from Sky and BT
Can you help?
Hi,
I got it sorted in the end, keep phoning sky, get escalated to highest technical level.
It’s not your SIM card they sent me 2 more, did not work. My sim in other phones did not work.
The problem I think was BT, as my mother got some money back on her BT account due to the issue.