There is no mobile signal where I live so I use wifi calling on my mobile & my wife uses a Vodafone Suresignal box. Recently the reception at the receiving end of calls made on both phones has been almost unintelligible when using wifi, however both work OK when using a 3g signal, The only common link is my wifi connection but as the mobiles work properly elsewhere Vodafone are understandably not interested. I have contacted V.M. but was unable to get the agent to understand my problem. The wifi signal at home is fine in all other respects.