I have a Novatel U620L modem connected to a USB port on my WIN10 computer. On the my.usb page it shows I have a 3G connection. On my verizon Iphone, which is sitting next to the computer, it shows I have 4 bars of LTE signal strength. Why won't the U620L connect via 4gLTE? Is ther a way to force this 4GLTE connection?