✔ 最佳答案
i have the same problem before and i figure out by myself.
First you should see that there's two USB cables that come with your phone's package. Then, choose the USB cable which has LG logo on it.
1. install the software to your computer.
2. Connect the USB cable to the phone and computer, remember to use the USB cable which has LG cable on it
3. then turn on your cell phone, click Setting, then click Connectivity, choose USB connection, then choose Data Service. Then open the phone synch software, you will be able to add phone number, appointments and notes.
If you want to transfer songs or picture, then do the same way, but instead of choosing Data Service, choose Mass storage, then your cell phone will automatically connect to your PC as a removable drive. so you can move songs to your cell phone.
I figure this by myself. Hope this helps you. I find out that the other USB cable which has NO LG logo on it is just for charging your phone by connecting to your computer, that is why if you use that cable to connect to your PC, it will show NO COMM. thanks!