@black-bobby
When my phone was switched from analog to voip last year, the old line remained active for quite a few hours. I could dial out using either the old line or the voip line. That is, until the OpenReach engineer pulled the plug either in the street cabinet or the exchange.
So, no need to worry. When the disconnection gets to the top of the engineer’s job list, your old line will be disconnected - if it hasn’t been already.
