Send and receave sms and mms

I would like a *.ddl or a class that can send and receave sms and mms. The message should be send and receaved from from danish phones. I would like to pay a high cost every month but i will not pay according to use. The price for this project that I am looking for is not according to the evential pay to telecompany it is just the cost for your class or dll. You can also implement it as a webservice if this is more easy.