I remember my parents back the 1970’s had a party line with a neighbour, if we picked the phone up we could hear their conversations.
Ditto - we had a party line. That is, for those unfamiliar, a number of subscribers on the same line. Each subscriber had a distinctive ring (from morse code), you'd only answer the phone if it was your ring pattern. Our number was 313K, the ring pattern was long-short-long. This was 70s in New Zealand.
I delivered newspapers back then (on my bike as it happens) and each fortnight had to collect the subscription money (frightening to think about now; a kid carrying around a bag of cash, we never really thought about it being unsafe!) Anyways, I was at a house collecting money (I knew them to be on our party line too) and I hear their phone ring... long-short-long... it was for us! Surreal, hearing a phone ring, knowing it was for you but it being in someone else's home! I probably even said 'that's for us'!
Fast forward maybe around 20 - 25 years. I was a bit of a geek/gadget freak back then. I had a mobile phone of some kind, a flip on the Orange network, and an Apple Newton (anyone remember those?) I could connect the Newton to the phone to check mail and browse the web... albeit painfully slowly. Not that I had any urgent need of it, it was just 'what I did' People regarded me as a bit of a weirdo. Funny to think that behaviour is now very much accepted.