Here are the steps to make a 3-way call on your iPhone:
1. Dial the first person and wait for the call to connect.
2. Tap the add call plus button.
3. Dial the second person and wait for the call to connect.
4. Tap merge calls.
5. The two calls merge into a conference call.
To add additional people, repeat steps 2-4 .
I hope that helps! Let me know if you have any other questions.
