We never had that.. however, i do remember when you called from a very old switch in a town we had a holiday home this is what would happen.

you dialled say 39999 (pulse)
the dial tone would go away..
then you'd hear another dialtone and the whole number being pulsed out.. then bebebebe and ring..

it was actually just dialing out on an E10 exchange! Pretty much behaving like a glorified 1950s analogue PABX.

Anyway, if you dialled 39999 and then very quickly tone dialed before it started sending the pulses you could continue tone dialling (the E10 would ignore the pulses) so you'd end up getting any call you wanted for 11 pence [Linked Image] All the stingey backpackers knew this!

All that stuff is LONG LONG gone now though. I think it was prob. one of the only very old switches left in the country, no idea what it was even! could have been old xbar or even SxS.

Telecom noticed the payphone billing discrepencies and suddenly all the payphones went over to digital lines, presume they just passed through the old switch.. and with in a few weeks it was fully digital.

Obviously i have never done this myself, but i was told about it by a tourist!!!