How can I find out who a phone line is with? It is not a BT line. They say it must be with another provider. The line is there in a flat I am about to move in to. The landlord does not know who the service provider is as previous tenants changed it and they are now out of contact.
There is not much more info I can give. Sorry. I just need to know where to find out the service provider for a UK phone line which is not with BT