They both use wires was my point. The VOIP system would most likely work if you lost power if you had your data modem on a UPS. Modems used to have batteries in them for this reason, but have removed them in newer models. On the flip side you cell phone will work during a power outage. It is the home equipment that is the problem, not VOIP technology.When we have storms internet goes away as does voip based phones. The old bell system hard wired phones had battery systems that powered them.. so an old land based line was beyond reliable .. your power went out but you still had perfect phone service.
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