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@Oliveranp just to clarify,
It was previously held by BT, then moved to TalkTalk and who have they moved to now?
I am not sure who would be responsible for retrieving the number, maybe the new provider.
I am sure someone with a bit more knowlege will advise, just wanted to clarify the situation to help them and you.
It would depend on which provider originally owned the number . If their first ever provider was BT Retail, and they have never moved address, then the number should still exist on the local BT exchange.
If they started with a different provider, then that may be the problem, as that provider would own the number.
I have asked a moderator to provide assistance, they will post an invite on this thread.
They are the only BT employees on this forum, and are based in the UK.
Just to be clear, do you want BT to provide your parents service ( so in effect cancel Sky) or BT assist in helping Sky get the number ?, if you ( or your parents ) are happy to become a BT customer , then it's possible that the number could be re- allocated ( although it probably wouldn't be instant , a new BT number then a renumber back to the original number ), if what you want is for BT to assist in Sky getting the required number, then the chances are that as they not 'BT' customers there would be nothing BT could or would do for someone who isn't a customer, BT are not responsible for rectifying other Telco's mistakes