- How to make a conference call using an Iphone
i. Dial the person you want to invite
ii. After the call connects, tap the “Add Call” icon on the homescreen
iii. Dial or select the next person from your contact list
iv. Tap the “Merge Calls” icon to join the calls
Check that your software is up to date
This may be due to your network settings. Specifically, conference calls may not be available if your call is using VoLTE (Voice over LTE) or Wi-Fi Calling.
Reset your Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before. Please be sure to make a note of your settings prior to completing this step.