Before you begin, make sure the speaker is already connected with your mobile phone. Verify this by playing some music on the iPhone. The music would be played through the Bluetooth speaker if they are connected.

To make a call:

1. Enter the phone number you want to call and press Call button on your mobile phone.
2. Tap on Audio Source on the display of your iPhone.
   
                
3. Select the Bluetooth speaker. 
   
                 
4. Speak towards the speaker.
   The voice of the caller would come from the speaker (instead of your iPhone).

To answer a call:

1. When the iPhone rings, tap on Answer on the display on your iPhone to answer the call.
2. Tap on Audio Source on the display of your iPhone. 
   
            
3. Select the Bluetooth speaker. 
   
                
4. The voice of the person you call would come from the speaker (instead of your iPhone).
   Speak towards the speaker.