The present invention provides methods, an application node (104, 26, 300), a policy node (108, 24, 400), a system for service delivery control related to access technology types and in particular for service delivery control based on allowed access technology types. Based on radio access technology types as defined by an application node related to a service provider as communicated to the policy node over the inter node interface Rx (106), and an radio access technology type with which a mobile phone (102, 22) communicates on at the moment, a determination is made as to whether the radio access technology type with which the mobile phone communicate son is among the allowed radio access technology types or not. If it is not, the current access technology type may be updated such that there is a match between the allowed radio access technology type and the current radio access rate.