1. A mobile device, comprising: a first communication unit associated with a first subscriber identity module (SIM) configured to maintain a first active subscription with a first communication network via the first communication unit; a second communication unit associated with a second subscriber identity module configured to maintain a second active subscription with a second communication network via the second communication unit; and a control unit, comprising: a determination unit configured to determine a category of an application installed on the mobile device; a classification unit configured to classify the application into one of a plurality of category groups based on the category of the application; and an association unit configured to associate each of the plurality of category groups with one of the first and second active subscriptions, wherein when the application is selected to run, the control unit is further configured to automatically establish a packet session for the application on the active subscription associated with the category group into which the application is classified.