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I am developing an application in which I have to send sms via GSM modem with usb port. With com port I have done but I can not find a way to do this via usb port. can anyone help?
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it's wounder full explain how can send the msg with help of C# language, hit this link and get a full solution.

How to send an SMS message from an application[^]

or one more link is

http://social.msdn.microsoft.com/Forums/vstudio/en-US/ea2cc48c-0cef-4e40-ac27-71007096d854/send-sms-with-c?forum=csharpgeneral[^]
 
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That's because USB is a BUS, not unlike the expansion slots inside your computer. It is NOT a port. There is no way to address the port the thing is connected to. You talk to USB devices through the interfaces they expose, such as a COM port.

You have already done it the correct way.
 
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