I have had similar problems with the recent complete disappearance of 3G at my address and calls which just don’t get through despite the phone being on and appearing to be connected. Since I am self-employed and work from home this is a BIG issue. Called Orange today and they told me my local 2G and 3G masts are not working, they are being replaced with new T mobile masts in the next few days and the signal should come back. However they also offered me a free home booster which will at least solve the home problem. Worth asking for one if your issues are similar.