I think it is showing what you are saved as in the other persons phone. There are ones where the guy presumably saved a girls number but she didn't bother to save his and another where the girl saved him as do not answer. I think the point is so you can see how the other person views you. These are mostly joke features and the feature you mentioned is pretty standard now.
Amazing app ideas ( sh.itjust.works ) Englisch
By Soren Iverson