Question: how to connect airpods to iphone for calls?
Answer: AirPods: (Pro and 2nd generation) Say “Hey Siri,” then say something like “Make a FaceTime call.” (You can also set either of your AirPods to summon Siri with your touch. ... 
AirPods: (1st generation) Double-tap either of your AirPods to summon Siri, wait for a chime, then make your request.