This disclosure is directed to establishing data access for a mobile device in a foreign mobile network. An exemplary method comprises executing a first attach operation (e.g., an IMSI attach operation) for a mobile device, the first attach operation resulting in a successful first attachment for the mobile device; determining, for a particular period, non-execution of a second attach operation (e.g., a GPRS operation) for a second attachment for the mobile device; classifying, based on the successful first attachment and the non-execution of the second attach operation for the particular period, the mobile device as a silent roamer; and determining whether the mobile device is associated with a data package for establishing a first quota of data access.