The phone call that Tom receives during the dinner are an indicator that he and Daisy are not a happily married couple.
In chapter I of The Great Gatsby, a novel written by F. Scott Fitzgerald, Tom receives a call, which indicates that he is having an affair with another woman. This leads Nick to believe that Tom and Daisy do not have a happy marriage as they pretend to show. Jordan Baker, a good friend of Daisy, is the one that tells Nick that Tom has another woman in New York. Throughout the novel, the reader finds out that the woman that tries to break up their marriage is Myrtle Wilson, a married woman that belongs to a lower class.