Microphone Choice?

I understand that there are three mics on an FP4. I find that, inadvertently, I often cover the mic used during calls (the one on the opposite side to the buttons). Does anyone know of a way to reassign which mic is used for calls? Ideally I’d like to use the bottom one.


Maybe and not easily

Thank you for that advice and help. I really appreciate it.
However, I’m very unimpressed that I might have to root the phone just to make it work as a phone so I’ll prob sell it & go to something that actually works reliably.
Thanks again.