Make SMS Gateway using C#.net

Hi friends…I have been into this SMS gate way stuff some 6 months back.My requirement was to send and receive sms using a mobile phone connected to my computer via bluetooth using a C#.net application.When i googled for it i got to know that there are many SMS gateway softwares available and obviosuly none of them are free…I used many sms gateways like OZEKI ,Mcore etc. …But the problem is all of them are paid softwares and so it does have limitations. So i tried making an sms gateway of my own and