I have a retail Motorola Moto G 16 GB with 4.3.
After updating to KitKat 4.4.2 (using the official Motorola process), I can't hear the caller's voice. But when activating the speakers or using a headphone I can hear the other side. Prior updating there where no problems at all.
I also did a full factory-reset, which did not helped.
With this issue the phone is practically unusable, I appreciate any help.