Is it possible to listen to the premises through the mobile phone located in it?

Question

Data protection

Can someone describe the technologies for listening to a room through a mobile phone located in it (provided that the owner of the phone does not have malicious intent), preferably in detail and not only with the help of spyware. More interested in information retrieval technologies using special equipment. And is it possible to get unauthorized remote access to the microphone and camera of a mobile phone without installing any additional software on the device?

Answer 1

For simplicity, we will assume that the phone is exactly what the phone is. Old, not a smartphone. In this case, indeed, we can assume that the OS manufacturer or the assembler of their bookmarks did not do it.
We also make a reservation that the phone does not have any interfaces such as an FM transmitter, BT, WiFi, IR, etc.
There remains one real and one far-fetched way.
At first far-fetched - in theory, you can try to use the phone as a pseudo-antenna. It will resonate against ambient sounds. Well, roughly speaking - it's like taking an image from the monitor. Why contrived? Because I see it as a near-scientific heresy, terribly difficult to set up, a lot of unknowns ...
Now real. OPSOS can quite realistically remove the voice from the microphone. I have not seen evidence that they are doing this, which convinced me. But technical uniformity - certainly - is.
The rest is from holes in technology - the old version of the bluetooth protocol, a talker like Siri in anticipation, in theory, also removes sound ...