Please follow the below methods:
1. During the call, the sound source of your phone is far away from the phone's microphone, and the sound intensity collected by the phone is small. It is recommended that you speak to the microphone at the bottom of the phone.
2. The voice of personal communication is low, please increase your volume from time to time.
3. The network is unstable and the signal is weak during the call. You can try to change the environment appropriately.
4. When the other party is talking, the volume setting is small, which affects the received volume. Please press the volume plus button during the call.
If the above methods cannot solve the problem, please back up your data and bring your purchase certificate to the realme service center for testing.