If others can't hear you in your Zoom meeting using the mobile app, follow these steps to troubleshoot the issue:
Ensure your microphone is not muted. If you see the muted Audio icon in the meeting controls, tap it to unmute yourself:
If you are still muted, the host may have muted you upon entering the meeting. Ask to be unmuted by sending a chat message to the host.
Ensure you have connected your mobile device's audio. If you see the following Audio icon in the meeting controls, tap it and select Call via Device Audio. If prompted, allow Zoom to access your microphone.
Try using a headset with a microphone if possible.