The present disclosure relates to a method of charging packets in a mobile network using a combined packet gateway (PGW) and serving gateway (SGW) which includes receiving a data packet; determining at least one of a rating group and a service rule associated with the data packet; and determining a state of a user device associated with the data packet. When the determined state of the user device comprises a connected state, the method includes charging the data packet, including updating an amount of credit in an account associated with the user device based on the at least one of the rating group and the service rule, and sending the data packet to an enodeB. When the determined state of the user device comprises an idle state, the method includes preventing delivery of the data packet to the enodeB such that the data packet is not charged.