Method and system for preparing and transmitting sms messages in a mobile radio network

Method for preparing and transmitting SMS messages in a mobile radio network, wherein a mobile radio user sends with his mobile device a USSD message comprising a service code for identifying a SMS sending service as well as an identification of the recipient and a text field. This USSD message is forwarded to a USSD handler. A gateway connected with this USSD handler converts said USSD message into at least one SMS message. Said SMS message is forwarded over a short message center to said recipient.