iPhone 16 Pro call echo in headset mode

Please contact your Carrier. This is not an iPhone settings issue as you said this is happening on Voice Calls.

• Sometimes, weak signal or network congestion can cause audio to be routed back to you, creating an echo effect.
• Carrier settings updates can sometimes improve call quality. To check for carrier updates, go to Settings > General > About. If an update is available, you'll be prompted to install it.
• Ensure there are no physical obstructions around the microphone or speaker areas of your iPhone, such as a case or debris.
• During a call, try toggling between the speakerphone and regular phone mode. Additionally, check if the issue persists when using headphones or a Bluetooth headset.

Expressing or conveying auditory experiences effectively through these forums may be challenging. The underlying sound issue on your iPhone cannot be accurately diagnosed from a YouTube link. Factors such as your iPhone's specific sound settings, visual defects, and potential hardware problems cannot be assessed through this method. For more personalized and in-depth assistance, I recommend securing a Genius Bar Reservation and exploring the various support options provided by Apple.

Get a Genius Bar Reservation and Apple Support Options - Apple

When you encounter issues with your Apple devices, the Genius Bar at Apple Retail Stores is the go-to place for expert assistance. The Genius Bar is staffed by knowledgeable Apple employees, often referred to as "Geniuses," who can diagnose and resolve a wide range of hardware and software-related problems. To ensure personalized attention and a convenient visit, Apple provides the option to schedule a Genius Bar Reservation.

Contact Genius Bar.

Manage Reservations - My Reservations - Apple