Open the X app on your device by tapping its icon on the home screen or in the app drawer.
Navigate to the Direct Message section by tapping the envelope icon located at the bottom right corner of the screen.
Choose an existing DM conversation from your list of contacts or start a new one by tapping the "+" or "New Message" button.
Once you're inside the conversation, locate the phone icon at the top right corner of the screen.
Tap on the phone icon to reveal the audio and video call options.
Select either the audio call or video call option based on your preference.
Wait for the other person to receive the notification on their device about your call and for them to accept it to begin the call. (Image Credit: All Images From Freepik)