Please tell your OH that bad weather can affect a mobile phone signal considerably. "The weather may affect the strength of a signal, due to the changes in radio propagation caused by clouds (particularly tall and dense thunderclouds which cause signal reflection), precipitation, and temperature inversions." Also smart phones are smart not just because they are computers but because of the technology that goes into enabling them to get as much information as possible from the signals they receive. The Doro may just not have the same capability as more sophisticated phones (I don't know though). Rather than contact Doro, contact EE, they should know about their signal strength. I was a mobile phone engineer for some years. I have a few tales to tell about trees growing into the line of sight (between phone masts) and, in the early days, how the strength of a signal in an area went up and down with the gas holders!