HTC One M8 User Manual page 311

2. If you don't see your headset listed, tap Scan for devices to refresh
the list.
3. Tap the name of your headset in the Available Devices section.
HTC One pairs with the headset and the headset connection status
is displayed in the Paired Devices section.
4. If prompted to enter a passcode, try 0000 or 1234, or consult the
headset documentation to find the passcode.
When the Bluetooth headset is connected, you'll see
Reconnecting a Bluetooth headset
Normally, you can easily reconnect your headset by switching on
Bluetooth on HTC One, and then turning on the headset.
However, you might have to connect manually if your headset has been
used with another Bluetooth device.
1. Turn Bluetooth on and check the list of paired devices.
See Turning Bluetooth on or off
2. Tap the headset's name in the Paired Devices section.
3. If prompted to enter a passcode, try 0000 or 1234, or consult the
headset documentation to find the passcode.
If you still cannot reconnect to the headset, follow the instructions in
Unpairing from a Bluetooth device
under Connecting a Bluetooth headset
on page 310.
on page 312, and then follow the steps
on page 310.
Wireless sharing
in the status bar.
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