Simulation help!

Question

1) Recently i am working on a transaction-based mobile application, and it involves sms simulation. for example, custmers can order products through the mobile phone. if the products are unavailable, a sms message will be sent to the customer's mobile phone. I know .net program like sharkysms. but i don't know how to implement it or can it be integrated into my mobile application in order to use it?......since it is simulation, that means message sent out from the application will finally be accepted by the application itself as well...is it make sense for me to do this simulation?? do i need sms gateway for this.....if it does.. any free sms gateway suggested??.....i refers to a lot of reference books, but can't find any solution and i really have no idea on how to implement this sms simulation....hope u guys can help me!.. 2) I choose C# ASP.NET mobile web application to do the program.....i know how to deploy it on openwave simulator but i also hope to deploy it on PDA or Pocket PC simulator...can i do that??