What would happen if you contacted fellow survivors? You mean like another group of survivors would join your group?
no, you wouldnt be able to contact other survivors in your group, but sometimes you may get in contact with someone and they are in an unexplored building or something of the like. then, depending on their personality that will determine if u have to get them or if they come to you. but if they want you to get them, you can choose not to get them :P if u want that is