A method for controlling service features of services made available to mobile subscribers in mobile radio networks, comprising the following process steps: a) receiving a first short message - SMS - from a mobile subscriber in a first gateway device in the form of an SMS application gateway of a mobile radio network which does not enable any packet data transfer, wherein the short message - SMS - comprises data which identify the mobile subscriber and information for controlling a service feature of a service that is made available to the mobile subscriber in a mobile radio network having an only packet transferring access network; b) generating or realizing a command for controlling the service feature of the service made available in the mobile radio network having the only packet transferring access network on the base or by means of the control information of the received short message - SMS - by means of the first gateway device in the form of the SMS application gateway of the mobile radio network that does not enable any packet data transfer; c) transmitting the data which identify the mobile subscriber and the generated or realized control command from the first gateway device in the form of the SMS application gateway of the mobile radio network that does not enable any packet data transfer to a second gateway device in the form of the application gateway of the mobile radio network having the only packet transferring access network; d) authorising the mobile subscriber with respect to a device (TAS, HSS) of the mobile radio network having the only packet transferring access network by the second gateway device in the form of the application gateway of the mobile radio network having the only packet transferring access network by means of the data which identify the mobile subscriber; and e) executing the control command by the device (TAS, HSS) of the mobile radio network having the only packet transferring access network by means of the second gateway device in the form of the application gateway of the mobile radio network having the only packet transferring access network in case of a successful authorization, wherein the information for controlling the service feature of the service made available to the mobile subscriber in a mobile radio network having the only packet transferring access network, which information is contained in the short message - SMS - received by the first gateway device in the form of the SMS application gateway of the mobile radio network which does not enable any packet data transfer, is subscriber controlled input encoded, SCI-encoded, information. a) receiving a first short message - SMS - from a mobile subscriber in a first gateway device in the form of an SMS application gateway of a mobile radio network which does not enable any packet data transfer, wherein the short message - SMS - comprises data which identify the mobile subscriber and information for controlling a service feature of a service that is made available to the mobile subscriber in a mobile radio network having an only packet transferring access network; b) generating or realizing a command for controlling the service feature of the service made available in the mobile radio network having the only packet transferring access network on the base or by means of the control information of the received short message - SMS - by means of the first gateway device in the form of the SMS application gateway of the mobile radio network that does not enable any packet data transfer; c) transmitting the data which identify the mobile subscriber and the generated or realized control command from the first gateway device in the form of the SMS application gateway of the mobile radio network that does not enable any packet data transfer to a second gateway device in the form of the application gateway of the mobile radio network having the only packet transferring access network; d) authorising the mobile subscriber with respect to a device (TAS, HSS) of the mobile radio network having the only packet transferring access network by the second gateway device in the form of the application gateway of the mobile radio network having the only packet transferring access network by means of the data which identify the mobile subscriber; and e) executing the control command by the device (TAS, HSS) of the mobile radio network having the only packet transferring access network by means of the second gateway device in the form of the application gateway of the mobile radio network having the only packet transferring access network in case of a successful authorization,