Why can't I hear telephone calls?

[AC Question]

I cannot hear telephone calls

I cannot hear telephone calls with MY nexus 6 loudspeaker, but I can hear with head set. It is only forma telephone calls, I perfectly hear forma example a video on YouTube with the device louddpeaker, bit noto telephone calls. Please help. Claudio

 

[B. Diddy]

Re: I cannot hear telephone calls

Welcome to Android Central! When you select speakerphone, can the other person hear you?

Also, is Bluetooth on all the time? If so, could it possibly be connecting with some Bluetooth headset you have lying around the house? Some Bluetooth devices can have a range up to 50, maybe even 100 feet, so even if it isn't lying right nearby, it might still be connected.