For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
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Logo design credit goes to: tubbadu
That crackling sound you had on your calls back in the analogic era. Not sure is a feature but made calls more warm.
It was a build-up of something or other (carbon?) on the microphone part of the caller’s handset. You could fix it by tapping the handset sharply on a hard surface. Source: I used to work in radio back in the 80s.
Wow I am fascinated a lot by the radio's world, especially pre-digital era. Hope to never meet me irl or i'll ask questions for a couple of hours lel
Not to mention the cross talk communications you could have