The present invention is related to a service accounting system containing one or more classified service accounts, in particular for mobile/cellular services. More specifically, a service accounting system connected to a main accounting system, part of a main account being transferable to a service account, and the use thereof are described. The invention provides a solution to deal with the accounting of differentiated services. In particular, a solution is provided to give users control over their expenses on a differentiated service basis. Also for service providers, a solution is provided to take actions on a differentiated services account basis.