[Windows Central Question]

Simply put I can hear the person on the other end of the line but they can't hear me.

[Indistinguishable]

Simply put I can hear the person on the other end of the line but they can't hear me.

Hi there - I'm afraid we're going to need a bit more information to help you out. What type/model device are you using? Is this problem happening with everyone? Or just one person?

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[Chintan Gohel]

Simply put I can hear the person on the other end of the line but they can't hear me.

try a restart and check again if it performs the same way
Make sure the volume set is high or at maximum

[nanafaith60]

This is a Lumia 640 and the problem is with

[nanafaith60]

This is a Lumia 640 and the problem is with everyone. The phone actually belongs to a friend and with all calls she can hear us but we are not able to hear her.

[Chintan Gohel]

This is a Lumia 640 and the problem is with everyone. The phone actually belongs to a friend and with all calls she can hear us but we are not able to hear her.

then it looks like there's something faulty with the mic - is it under warranty?

Just to be sure it's the mic, can you try a whatsapp or skype call?