A card holder apparatus (100) for installing a phone card (200), and a mobile device are provided. The card holder apparatus (100) includes a card holder (1), a card groove (11) being defined inside the card holder (1); and an elastic member (2) provided to the card holder (1), at least a part of the elastic member (2) being located at at least one side wall of the card groove (11). The elastic member (2) is configured so that when the phone card (200) is placed into the card groove (11), the elastic member (2) is compressed so as to squeeze the phone card (200).