hello
First to interact with Mobile(Hardware ) through your application you have to create a physical conection using a serial cable ,then you can connect them using rs-232 or USB port which ever you are intrested .
once the physical communication is established then you have to use Serial port control available in .net2.0 which is used to communicate with the external devices like modems,
for serial port control you will find properties like Comport,baudrate,parity,stopbits which nothing but mostly related to your hardware(modem) settings,
once all the are fine you can use port.Write() method to send data to serialport and port.Read() method to get data from Serialport .
Hope may help ful to u
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