Posted by Nigel Graham 2 on 17/12/2021 18:14:36:
Your last sentence though… Do you mean the 'phone's microphone is on all the time, or that it receives a radio on/off command from the other equipment? Either way I'd wonder why you need turn the 'phone remotely sibnce you need it your hand to use?
It does depend on the operating system on your phone. I'm not familiar with iPhones but phones with Android 8 or later keep the microphone on while the lock screen is showing by default. You can turn it off in Settings but how many people do, and anyway anyone who can hack into your phone can turn the microphone on again and listen to it.
When my phone is plugged into the car the microphone is on all the time and Google is listening so that if I say, "Hey Google, navigate to <certain address>" the GPS will take me there. It also gives me hands free telephone via the car speakers. Of course Google knows exactly where I have been but they are welcome to that information.
Russell