my main phone-call mic (on the bottom of the phone) doesnt work probably because of an action i did, but the one that is (probably) on the top of the phone which is used both in video takings and phone-call on speaker mode. so the thing i want is to use the latter mic as the default mic, since i cant take instagram videos, cant send voice messages through whatsapp, and also have to use speaker mode only when i want to talk with a person on a call. i can use external ones, such as earphones, but i dont have them on me all the time. thanks for everything by now.
Oh! Then there is not much troubleshooting that will help I'm afraid and I would recommend that you get in touch with your Local support team, so they can arrange for the device to be sent in and examined at an authorized service centre.