In order to make a video call, both you and the person you're calling must:
Be using a Video Calling-enabled phone
Be connected to the Verizon 4G LTE network
You can initiate a video call in any of the following ways:
Video Calling group: You can select a contact from the Video Calling group in the Groups menu within your Contacts app.
Contacts app / Address Book: Select a contact that's capable of Video Calling and tap the Camera icon.
Phone app: Enter a mobile phone number of a contact that's capable of video calling and tap the Camera icon.
Call History logs: Select a phone number indicated with a Camera icon.
During an HD Voice call: You can upgrade an HD Voice call to a video call by tapping the Camera icon on the in-call screen.
A video call can be established only after the called party accepts the video call request.