I just switched from my old Galaxy S6 to A51 and I am no longer able to record calls with the apps I used before. I tried 5 different call recording apps on my new A51 and none of them are able to record calls. You cannot hear a sound on a playback of a call record meaning no recording is actually taking place. I tried it on my sons Galaxy S10 and it works just fine with the same Android version as my A51. It looks like this is not a 3rd party app issue but rather A51 issue. Kindly ask for help.