Xintom City: Qingdao Registration Date: 09-02-05 TA Q&A Change the COM3 port to COM 1 port 1. Open the Phone and Modem option in Control Panel. 2. On the Modems tab, click the modem you want to configure, and then click Properties. On the Advanced tab, click Advanced Port Settings. If this option is not displayed, the modem does not support changing the assigned COM port. 4. In COM Port Number, click the port number you want to use.