Why did speakers used to make a strange noise when a phone is about to receive a message? Also, why that doesn’t happen as often now (little to no instances)?

Question

Why did speakers used to make a strange noise when a phone is about to receive a message? Also, why that doesn’t happen as often now (little to no instances)?

In: 1651

Answer 1

Any metal wire can act as an antenna and pick up radio signals. It just so happens that older phones used a radio frequency that speaker amplifiers are good at picking up, so they would and so you could hear your phone’s radio data.

Modern phones use different frequencies (due to much higher data speeds) so it’s no longer the correct frequency for speakers to pick up.