What do I do if no sound is heard during a call?

Please follow the below steps:
1. Confirm whether the mute button on the call is on. If so, tap to turn off.
2. The microphone in your phone may be blocked or damaged by foreign matter, dust or debris. Please contact our customer service centre for further testing and confirmation.
3. Check the signal strength at both the caller and receiver ends. Poor signal on either end can affect the clarity of sound.
4. Use an earphone suitable for your phone and check if the other person can hear you.
5. Update the phone software.
6. Restart your phone.
If the issue persists, contact the Nothing Support Team for further assistance.