A:Answer Hi phurious, Thank you for choosing Sony. When an incoming call arrives, a ring tone will be heard from the headset, and the indicator (blue) flashes quickly.
You should hear either of following ring tones, depending on your smartphone or mobile phone.
Ring tone set on the headset
Ring tone set on the smartphone or mobile phone
Ring tone set on the smartphone or mobile phone only for a Bluetooth connection
If you are not hearing the ring tone, please make sure to set them on your mobile device
When receiving a call by operating smartphones or mobile phones, some smartphones or mobile phones receive a call with the phone instead of the headset. With an HFP or HSP connection, switch the call to the headset by holding your finger to the headset’s touch sensor control panel until it switches, or by using your smartphone or mobile phone.
For more information, please check out our Help Guide link: https://helpguide.sony.net/mdr/wh1000xm4/v1/en/contents/TP0002752785.html
Regards,
Carl