For iPhone users

Your phone may temporarily switch audio output due to system behavior.

Press the side button to open the Emergency / Power Off screen, then exit it and return to your music player to resume playback. If audio still plays from the phone speaker, turn off Bluetooth, then turn it back on and allow the headphones to reconnect automatically. If needed, reset the headphones and reconnect them to your iPhone.

Also, check call audio routing.

Go to Settings > Accessibility > Call Audio Routing. Make sure Bluetooth Headset is selected.

For Android users

• After connecting the headphones to your phone or tablet:

• Go to Settings > Bluetooth.

• Find Space 2 in the device list and tap the settings icon next to it.

• Make sure Media audio and Call audio are both enabled.