How to enable stereo recording on tablets/smartphones yielding only mono albeit having two internal microphones?

Question

So far, I thought it was a firmware error, but now I just found a 2nd device that has two internal microphone capsules but only yields a monophonic signal (1st one was the S

Answer 1

See what worked for me in the Motorola Moto G. I understand it is very dependent on the vendor/model, but I tried many combinations until I found that only with 48000 Hz I was getting stereo recording in that particular phone:

Recording stereo audio with a Motorola Moto G (or Moto X)