The campaign in "Call of Duty: Black Ops 6" has a very unique task of answering calls. If you want to do this task, you only need to answer every call in an emergency. When you reach the input When entering the main complex with the Director Key Card, you will be prompted to open the elevator directly in front of you.
How to answer the call task in the campaign
Answer the phone
Answer every call in an emergency
When you arrive at the main complex where you enter your Director's Key Card, you will be prompted to open the elevator directly in front of you. Try doing this, then go back to the middle and hear the phone ring, pick it up.
The second phone is after you exit the first area with the abomination and get the grappling hook. Once you go down the stairs back to the main complex, immediately turn left and follow the corridor to find a phone on the left.
Go back up the stairs, but instead of going through the double doors, turn around and look at the balcony opposite, and run forward a little to see another phone on the left behind where the corridors intersect.
After this, turn 90 degrees to the right (facing the phone from the intersecting corridor, it is to my right in the image) and walk down that long corridor. You will then come to a balcony overlooking the main complex where the statue is located. Climb to the other balcony on the opposite side and continue towards another intersecting corridor. The phone will be on the left side of the same corridor next to the intersection.
The last call is the easiest, after you have collected and entered all 4 Director's Keycards, go back and enter the elevator. Now, just wait until the elevator takes you to the top and you will find that the last mobile phone is related to the story and cannot be missed:)
