Thanks for your response. I don't see an indication of 3G or 4G on the unit, but I assume it is a 3G, since I've had it for some time. It's Huawei ModelF256-BVW. It isn't showing any improvement of signal level with the Network Extender, while our cell phones show multiple bars (whereas previously we were working with an average of 1 bar...). Is there a 4g "home phone" unit that works with the Network Extender?