Landlines were state-of-the-art tech more than a century ago; depending on when you define its invention it came at some point between 1844 and 1877 [1] and it was widespread by the second world war. There was a huge portion of the last century in which "just" having a landline was a relatively constant, relatively well defined utility and (from the consumer's point of view) the technology was mature and did not change much between arguably 1950 and about 1990. The rotary dial pulse dialling system was patented in 1891; the telephone I grew up using (in the 1980s) used essentially the same technology and pulse dialling gradually replaced it over the course of several decades. Most of the innovation took place on the side of the exchange, and the average telephone user probably noticed little other than changes in billing and a slowly decreasing frequency of talking to an operator.
Cellphones are completely different. My "daily driver" smartphone, bought in 2017 for ~1/4 of my monthly salary, is obsolete and I have rooted it in order to continue to install security updates. This has locked me out of my Danish bank account.
My mum's 1980s PSTN phone still works, even when the mains electricity is out, no technology change required.
Cellphones are completely different. My "daily driver" smartphone, bought in 2017 for ~1/4 of my monthly salary, is obsolete and I have rooted it in order to continue to install security updates. This has locked me out of my Danish bank account.
My mum's 1980s PSTN phone still works, even when the mains electricity is out, no technology change required.
[1] https://en.wikipedia.org/wiki/Timeline_of_the_telephone [2] https://en.wikipedia.org/wiki/Pulse_dialing