Greg went blind recently, and he's trying to make his mobile phone more accessible. His in-call volume has gotten really low, and he can't adjust it back up. Leo says there may be something from an update that has changed the internal settings. If your screen reader can pick it up, go into the sound settings and adjust it. It may also be a feature called "Adapt Sound." Look there and see if it's changed your sound. Also turn off Dolby. You can also try turning off Bluetooth. It may think you're using a Bluetooth handset. It could also be the speaker for your ears has broken. Try using headphones and see if the volume is normal.