Both parties must be online to make a phone or video call to another user. You will be able to view the missed call notification if you return to the program after you have made the call and the recipient has not answered. The missed call notification will be in the Messenger chat and both parties will be able to see it. The person who didn’t pick up will also receive a pop-up saying that they have a missed call. You may also leave a voicemail if the person you’re trying to contact is unavailable or if they’re not accepting calls. Another option is to make a phone call so that when you return to the platform, they’ll be greeted by a missed call notification.