Sony WF-C710N Help Manual page 79

If you want to play music from the other device, stop playback on the device that is playing the music, and start
playback by operating the other device.
Even if you start playback by operating the second device while playing music on the first device, the music from the
first device will continue to be heard via the headset.
Talking on the phone when the headset is connected to 2 devices via Bluetooth connections
When the headset is connected to 2 smartphones via Bluetooth connections simultaneously, both devices will be in
standby mode.
When an incoming call arrives to the first device, a ring tone is heard via the headset. When an incoming call arrives
to the second device while talking on the headset, a ring tone is heard via the second device.
If you finish the call on the first device, the ring tone from the second device will be heard via the headset.
Related Topic
What you can do with the "Sound Connect" app
How to make a wireless connection to Bluetooth devices
Listening to music from a device via a Bluetooth connection
Controlling the audio device (Bluetooth connection)
Receiving a call
Functions for a phone call
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