A buzzing sound in iMessage voice messages on an iPhone 13 Pro Max usually points to a microphone‑path issue that only affects the bottom or front mic used specifically for voice messages. iMessage uses a different microphone path than the Camera app, Phone calls, or Voice Memos, so it is possible for buzzing to appear only in iMessage recordings even when every other app sounds normal.
This buzzing often comes from one of three causes: the noise‑cancellation system over‑correcting, a partially obstructed mic port, or a failing bottom microphone. Cleaning the mic was a good first step, but buzzing that happens only during iMessage recordings usually means the microphone is picking up electrical noise or distortion that the iMessage audio filter cannot remove.
A good test is to record a short video using the rear camera and speak near the bottom microphone. If the buzzing appears in the video audio, the bottom mic is likely failing. If the video sounds normal but iMessage still buzzes, the issue is usually software‑related and tied to the iMessage audio processing path.
Resetting the phone rules out temporary software glitches, but if the buzzing continues only in iMessage voice messages, the next step is checking whether the buzzing happens in Voice Memos or Camera ➡️ Video. If those recordings are clean, the microphone hardware is working and the issue is isolated to the iMessage audio filter. If the buzzing appears in all recordings that use the bottom mic, the microphone hardware may be failing and Apple can run a diagnostic to confirm it.
Axel F.