Solved! Go to Solution.
You are missing that if the cabinet is full Infinity won't be available. The port you are currently using obviously won't be showing as free and wouldn't necessarily get allocated to you if you ceased your Sky service to switch if there are other waiters. What does the DSL checker show for your cabinet? https://www.dslchecker.bt.com/adsl/ADSLChecker.address
Yep, waiting list. No, connections don't get transferred, they go to the next on the waiting list.