A method for operating a mobile network, especially for charging traffic within the mobile network, wherein monitoring of chargeable events regarding traffic from and/or to a mobile node will be performed by a Charging Function for collecting charging data. The method is characterized in that a Charging Function's sub-function for monitoring of chargeable events on a data flow level or IP (Internet Protocol) flow level will be additionally located—as an additional sub-function D-CEMF (Delegated Chargeable Event Monitoring Function)—on at least one further network element, which is different from the Charging Function and which allows to traverse breakout and/or localized traffic of the mobile node, so that the Charging Function and the further network element each are including such a sub-function, and that the additional sub-function D-CEMF will report information regarding monitored chargeable events to the Charging Function. A mobile network for carrying out the method is described.