1. A method for a device to label a number, comprising: receiving an application identification of a service application and an unknown number sent from a calling terminal, the unknown number being a telephone number provided to a user by the service application, and the calling terminal invoking a telephone application through the service application to call the unknown number; acquiring an application type of the service application according to the application identification; and labeling the unknown number according to the application type, wherein the labeling includes: determining whether a user feedback label corresponding to the unknown number exists, the user feedback label being a feedback label regarding a user type of the unknown number, and being collected from a previous user of the service application; when a user feedback label corresponding to the unknown number does not exist, labeling the unknown number with an attribute label corresponding to the application type; when a user feedback label corresponding to the unknown number exists, labeling the unknown number with the user feedback label or the attribute label corresponding to the application type, wherein the attribute label is for labeling a user type of the unknown number; and wherein labeling the unknown number with the user feedback label or the attribute label corresponding to the application type includes: detecting whether the attribute label is identical to the user feedback label; when the attribute label is different from the user feedback label, acquiring a most recent user feedback label, and detecting whether a time duration between a first time when the user feedback label is generated and a current time is longer than a first predetermined time duration; and when the time duration between the first time and the current time is longer than the first predetermined time duration, labeling the unknown number with the attribute label.