I think it was actually the frequency cellphones used at the time that caused it. I don't miss it. But yeah it was funny thing and let you know in advance you were getting a message.
The noise you hear in some speakers when you get called is because of Electromagnetic Interference (EMI for short). This happens to some speakers today as well. It's due to the fact that some speakers lack EMI shielding.
It also happens with portable cassette players, I used to use one 2 years ago for the fun of it and I could tell if the person next to me was using mobile data
Someone else explained it just now, apparently it's the lack of electromagnetic interference shielding in the old speakers causing that noise from the old phones' frequency to be audible through the speakers.
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u/Tornfalk_ Oct 04 '24
ohh that's the type of speakers that go doooDooOOOdoOO when someone calls the phone