IMO it is highly unlikely that the phone will have been separated from Corrie. What are the chances of Corrie's phone ending up in somebody else's vehicle while at the same time Corrie disappears in an unrelated incident?
I agree. The chances of being separated with no witnesses when there was a fair bit of activity that night, in an area with no clear cctv and to then end up in a bin lorry that happens to collect that one particular bin?