Why does the speaker squeak when the mobile phone sends a text message or communicates?

Because the mobile phone works by radio transmission (an electromagnetic wave) when communicating or receiving information, it needs to send and receive electromagnetic pulse signals, so it will of course have greater radiation when used.

Audio is very sensitive to electromagnetic waves, so when strong electromagnetic waves pass through the audio (of course, current passes through the audio), the audio will be affected by the frequency of electromagnetic waves, so an acoustic signal is used to replace the electromagnetic wave signal and amplify it, which is somewhat similar to the previous telegraph.

In addition, although the notebook also has a stereo, because the notebook shell has a good ability to see radiation, it can better isolate radiation, and the radiation of the desktop (especially behind the host) is 3-4 times that of the notebook, so sometimes if the radiation of the mobile phone is too large, it will also lead to the reaction of the computer (such as the monitor).

The electromagnetic radiation released at the moment when the mobile phone is connected is the largest, so it is best to answer the phone when the mobile phone rings for one or two seconds or twice. I hope it helps you.