You can start a WhatsApp video call from the Calls tab by looking up a contact or from a chat thread.

You can start a group FaceTime and make calls with up to 32 other Apple devices, just by using the plus icon or "Add Person" ...

You need a quick, face-to-face chat with a remote team member. What's is the best way to make this happen? Do you just press a “start call” button and pop up on their screen? Do you send an email ...