About the setting of the CUSTOM button and the operation of the Call button
The relationship between the setting function of the CUSTOM button and the operation when pressing and holding the 
(call) button is as follows.
Android
| Setting of the CUSTOM button | Pressing and holding (for 2 seconds) of the (call) button |
|---|---|
| Activating the Google app (default setting) | Activating the Google app |
| The Google Assistant | No effect |
| Amazon Alexa | No effect |
iPhone
| Setting of the CUSTOM button | Pressing and holding of the (call) button |
|---|---|
| Activating Siri (default setting) | Activating Siri |
| The Google Assistant | Activating Siri |
| Amazon Alexa | Activating Siri |
