Well, for what it is worth, the 4G site near me just started providing a signal you can connect to. I'm using a USB 551L by the way. At first, the 4G would connect for about 8-10 minutes, then disconnect and reconnect again. I went into the device manager and found that all the com ports associated with the device were set at 9600. I moved them to a faster setting...seems to have helped. Let me know what you find.