not hearing caller during phone call? (lumia 520)

                                                FULL PHONE SPECS: Nokia Lumia 520

CAUSES

- Low volume setting

- Low network signal

- Ear speaker obstructed by external object (dust, phone casing)

- Mute option enabled by caller

- Device malfunction

- Outdated software version

SOLUTION

- Adjust volume level

- Ensure there is sufficient network signal coverage

- Ensure the phone’s ear speaker is free from any obstruction

- Ensure the caller has not enabled the mute option on their end

- Restart the device

- Update the device software