I Cannot Hear Anyone When Making A Call, What Do I Do?

It seems that the issue would be the earpiece port of your device (the speaker that goes to your ear). Before initiating a return for your device, please try to clear the earpiece of the handset. To do that, please follow the steps below:

Turn off your iPhone.
Use a soft-bristled brush/ toothpick/ painters tape to clean the speaker port, the earpiece and the microphone.
Turn your device back on and re-try to make a call.

If the same issue persists, we would love to look into the device for you for a repair or even a replacement.