There are two internal microphones in later model Samsung mobile phones.
One is used for "normal" mobile phone calls and the other is usually used when the phone is used in "loudspeaker" mode, i.e. phone away from head.. A lot of apps use the upper microphone (used in loudspeaker mode) when making calls. Not totally sure which app uses which microphone but for normal network calls the lower mic is used.
Try using the earphones with the microphone attachment to see if you can both hear and be heard OK.
If you can be heard by the other party and you can hear them when making/receiving a call then it indicates that there may be problem with the headphone jack.
When headphones are used on a normal network call then the lower mic and the receiver are cut off and the speech/reception circuits are redirected to the headphone socket.
When calls are made in the ''loudspeaker" mode the headphone jack does not come into play as the speech / reception circuits are directed to the loudspeaker and the (usually) upper mic.
Is the headphone icon on at all, without the headphones plugged in when making network calls?
Only ask because when you plug in the earphones there is an internal contact within the earphone socket that operates and signals the audio controller to switch the audio away from the mic, / receiver to the earphone socket. The user is also notified by the icon symbol.
If there is an icon without the earphones being inserted then there is a problem with the headphone jack and it needs to be replaced, as mostly it is irreparable.
If there is no icon it doesn't mean the the audio still hasn't been switched over, there may be some other reason for that.
Have you tried a factory restore (hard reset) at all to see if this resolves the problem? Do a backup first as it will erase all your data and downloaded apps. You can always restore it after back to what is was using the backup.
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