You can use the Apple Watch Series 10 to participate in conference calls, but the functionality is somewhat limited compared to using an iPhone or other devices. Here are the key points regarding conference calling on the Apple Watch:
Conference Calling Capabilities
1. Using iPhone for Conference Calls: The Apple Watch does not have built-in features for initiating a conference call directly. Instead, you will need to set up the conference call using your paired iPhone first. Once the call is established, you can manage it from your Apple Watch[2][3].
2. Adding Participants: On your iPhone, you can add participants to a conference call by tapping "Add Call," connecting to another number, and then selecting "Merge Calls." This process can be repeated to include more participants, depending on your carrier's limitations[2][3][4].
3. FaceTime Audio Calls: With watchOS 10, you can make Group FaceTime audio calls directly from your Apple Watch. To do this, start a FaceTime audio call and then use the "Add People" option to invite additional contacts[5]. This feature allows for more flexibility in managing group calls directly from your wrist.
4. Limitations: The number of participants you can add to a conference call through your iPhone is typically limited to five, but this may vary based on your carrier's capabilities. Additionally, if you're using VoLTE or Wi-Fi Calling, some features may not be available[3][4].
5. User Experience: While on a call, you can view and manage active participants using your Apple Watch. You can also adjust the volume and mute your microphone during calls[6][7].
In summary, while you cannot initiate a conference call directly from the Apple Watch Series 10, you can manage calls and participate in them effectively once they are set up via your iPhone or through Group FaceTime audio calls.
Citations:[1] https://discussions.apple.com/thread/7329587
[2] https://support.apple.com/en-us/111787
[3] https://support.apple.com/guide/iphone/have-a-conference-or-three-way-call-on-iphone-iphab7e28b7e/ios
[4] https://support.apple.com/en-qa/guide/iphone/iphab7e28b7e/ios
[5] https://support.apple.com/en-hk/guide/watch-ultra/apdc38d7a95e/watchos
[6] https://support.apple.com/en-jo/guide/watch/apd32b6c5658/watchos
[7] https://support.apple.com/en-qa/guide/watch/apd32b6c5658/watchos
[8] https://discussions.apple.com/thread/251186914