A method for managing subscribed data plan of a communication device, the data plan includes a predetermined amount of Internet traffic for connecting the Internet. An end date of the subscribed data plan is set, and a time for querying residual data of the subscribed data plan is determined according to the end date. The residual data of the subscribed data plan is queried when the determined time is reached. Applications, of the communication device, which are to be updated are detected, and one or more of the detected applications are updated using the residual data of the subscribed data plan of the communication device.