This maybe a silly question but do you have a bluetooth headset linked to the phone?
I ask because sometimes I place my headset in my pocket or purse and it will turn on and connect to my phone and I wont know it so when I go to answer the phone it answers through my headset and therefore I cant hear the person calling and either have to use speaker phone or if I notice that the headset button (opposite the speaker button) is lit up green then I press that which cancels the headset connection.
If you dont have a bluetooth headset linked to the phone and its connected, then I have no clue. With this I would say exchange the phone.
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