[ian@huth]

As jimbo said, many builders and developers have for some years installed telephone points as standard when building or refurbishing properties. These are usually wired from the master socket to the outside world with a loop of wire left for ultimate connection to the suppliers network when the resident decides he wants service. More often than not the wiring at the master socket is not connected to it but left coiled for the telecoms engineer to connect. I would take the face plate off of the master socket to see if it is actually connected or not.

The landlord, management company or builder of the flat should know if the flats were pre-wired for telecoms and if so where the main access point for them is. You could also knock on a few neighbouring doors to see what telecom, TV and broadband services they might have.