I had the same issue a few months back. The cause was that it was stuck in headset mode. To see if this is the case, make a call, and turn up the volume. If it says headphones, it is stuck in that mode. You will need to clean out the headphone port with air. If this is not the case, here are some more troubleshooting http://vkrepair.com/iphone-6-2/iphone-6-cant-hear-caller/
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I had the same issue a few months back. The cause was that it was stuck in headset mode. To see if this is the case, make a call, and turn up the volume. If it says headphones, it is stuck in that mode. You will need to clean out the headphone port with air. If this is not the case, [http://vkrepair.com/iphone-6-cant-hear-caller/|here are some more troubleshooting ]
Hey Dustin!
I had the same issue a few months back. The cause was that it was stuck in headset mode. To see if this is the case, make a call, and turn up the volume. If it says headphones, it is stuck in that mode. You will need to clean out the headphone port with air. If this is not the case, here are some more troubleshooting http://vkrepair.com/iphone-6-2/iphone-6-cant-hear-caller/