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Welcome to this user forum. @Shaneo1091
Sky are an LLU (Local Line Unbundling) provider. They simply rent the copper line from Openreach, and connect their own equipment to it.
When you leave Sky, the line is released back to Openreach, and the Sky equipment is disconnected.
The line would then be free for Openreach to provide service for BT Retail.
Unfortunately changing from an LLU provider, to one which uses the BT Wholesale network, can take longer, as extra work is needed.
Once your phone line becomes active with BT Retail, broadband should follow a few days later.
Did you ask to keep the same number, as that can delay things?
Is your phone line still with Sky or has it been transferred to BT? Dial 150 and see what the announcement is.
Delays are nearly always caused by your existing provider releasing the number to BT Retail.
If you cancel and transfer a service, there is a minimum of 10 days before another provider can take over. This is an Ofcom requirement to reduce the incidence of slamming, or ordering errors where someone else gives the wrong address when placing an order.