Re: 'Button A-B' and grey payphones.
As young lads, I remember we used to talk to each other from phone boxes for free, at a pre- arranged time and place, I would ring my friend in another call box, I could hear what he was saying without pressing button 'A', after he had finished speaking I would press button 'B' and get my money back, we would then reverse the process and I could reply, I also seem to remember being told that you could dial local numbers by tapping out the number on the receiver rest.
John
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