To create a group, call first create regular call (over cellular or application)
Then, while in call, tap add call icon to add additional contact to call
Chose the contact from contacts list in bottom corner
OR Type the number on numerical pad to create second call
Then press the phone icon to create second call
When second call is connected tap on the merge call icon to create group/conference call
Note: Group call needs to have all callers on the same source of call, either cellular or application.