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You might actually get an answer after they've answered all the incoming treble 9 calls :lol:

The last working A/B button kiosk on the BT network was in the village of Rhenigidale on the Isle of Harris , in the mid 80's it was converted to a "blue" payphone and given a 6 digit number to allow incoming and outgoing calls without using the local operator.

press button A when the distant subscriber answers or press button B to get coins back if no reply.

Still available via the 100 operator or 0800-REVERSE but the charges are exorbitant.