Nothing... well, very little, actually, that could serve any fruitful purpose in Her Majesty's realm. While the core POTS network is still owned and operated by a monopoly (BT), it is entirely digital.
I am, however, rather keen to avail to myself some useful guidance on high-jinks of the telephony-based pranks variety. While I must keep some space in my brain for useful information (such as our national anthem, how to drink a cup of tea properly, and the rules of cricket) I am rather keen to immerse myself in what this site has to offer in terms of said pratical tomfoolery.