I have the lg usb 4g modem and a 5gig data plan. I usually use it on a computer with Windows xp, and all works well. Last night I used it on a different computer with windows 7. After being on for about 40 minutes, checking e-mails, looking at MSN.com (no videos, just reading the articles), and looking at two very small pdf documents on a federal website, I got a message that I had used 90% of my plan; when I looked at the bottom left panel of access manager where it shows how much you are using, it was showing that I was using one mb every two or three seconds. I used more than one gig in less than 40 minutes without downloading anything or doing anything else that would use a lot of data. I shut everything down, rebooted, turned on the device again, and went to acess manager. With just the device on, it was still using one mb every two or three seconds. Just to have the device manager on for two or three minutes was eating up 70+ mb.
I call tech support; they said they would get back to me, but haven't so far.