My main telephone line, at some point has been moved, and it now comes through into my daughter bedroom upstairs.
I no longer want this as i don't want the internet router in her room.
Can i disconnect the line, take the wire out, and run the cable into the hallway and reconnect into the cable box there?
Any help is welcome.
Yes you CAN, no you MAY not.
Only openreach can move the main socket. You could however get an extension socket installed elsewhere and plug the router in there.