1. If the headphones have established connections with two phones, and neither phone is in a call / voice conference, the headphones will output the sound of the phone with the incoming call.
2. If the headphones have established connections with two phones, and one of the phones is already in a call:
When the initially inactive phone receives an incoming call, you'll hear the incoming call ringtone on the headphones, and the headphone will prioritise controlling the phone with the incoming call. When you end the current call, the headphones will switch the audio channel to the phone with the incoming call.
Note: Please visit the official Nothing website to learn more about Dual Connection and view the product instructions. Alternatively, contact our Customer Service for assistance.