The HD Voice feature in Verizon 4G LTE coverage area allows up to 6 parties:however, each call must be initiated by call originator.
From a Home screen, tap the Phone icon (at the bottom).
From the Dial tab, enter a 10-digit number then tap Phone icon (lower-left).
To place a call from the Contacts list, tap the Contacts tab, then tap the appropriate number from the corresponding contact.
Tap Add (upper-right).
From the Dial tab, enter a 10-digit number then tap the Phone icon.
Once the call has connected, tap Merge (upper-right).