If you pay BT for line and calls and Sky for broadband, you are on a legacy ( and very poor value ) product called SMPF , shared metallic path facility…TBH , it’s odd you can still be on that as many years ago , Sky made pretty much an ultimatum to their broadband customers , join us for broadband and telephony ( so removing BT from the equation ) or find a new provider for broadband.
The info Sky have given you is not great , if you tell BT to ‘cease’ your telephone service , it will , by default cease your Sky broadband, leaving you without any service for a period, while you effectively get a ‘new’ line installed, with this type of SMPF , the broadband cannot ‘exist’ without a phone service to host it .
If your choice is to use Sky for both , it’s Sky that need to be organising with BT , not you , if all you want is to not have BT at all , and are prepared for some downtime , call BT and ask for your line to be ceased , knowing that you will then have no Sky broadband service for the period it takes for you to then contact Sky ( again ) and ask them to re provide you as a broadband and telephone customer , that’s the only way BT can be involved if it’s Sky you want to use .
If you were leaning towards BT supplying both services and ditching Sky , then BT would be ‘driving’ the ordering process , but because that’s not what you want , BT have no involvement apart from potentially following a request from you to cease your ‘line’ , if that’s what you want , call BT and ask for a cease .
