iPhone 13 video call issues
I recently purchased an iPhone 13. While there is no issues with my normal calls, my video calls through WhatsApp is of poor quality. The other person complains that my audio is choppy and gets cut in the middle, the voice is very low and sounds far away. I tried connecting to different Wi-Fi networks and also through mobile net. The voice is always low and far away and the audio gets cut intermittently during the call. I also tried video call through Google duo and have same issue. I removed my case and screen guard but nothing has helped with the issue.
I took the mobile to service centre where they tested the mic and found no issue. I am not sure where is the issue is but the video calls are bad. Any advice on the issue?