A mobile device for securing to a garment of a user thereof. Such a garment securable mobile device may be of a clamshell configuration with mating portions hinged to one another such that when closed toward one another a garment space is defined therebetween. A portion of a garment may be retained in the garment space thereby securing the mobile device to the garment. Retention of the garment portion may be enhanced by the use of gripping elements at the inner surfaces of one or both of the mating portions. A garment particularly configured for securing such a garment securable mobile device may also be provided.