Turn on your Bose headset
Put the headset into pairing mode by pressing and holding the Bluetooth button until the Bluetooth light flashes blue
Open Settings on your iPhone
Tap Bluetooth
Turn Bluetooth on
Wait for your Bose headset to appear under Other Devices
Tap the Bose headset name to connect
If prompted, confirm the pairing request
Wait until the headset shows as Connected
Test the connection by playing audio on your iPhone