Is buzzing related to network of other person?

[Guest IanBlackburn]

I have noted that whenever I call my BT land line at home and talk to my wife I get the buzzing and generally poor sound quality. However when I speak to her on her Orange LG7100 it's lovely and clear. It doesn't matter where I make the call from, or whether I make the call or she does. This seems to be a clear pattern - calling the BT landline at my home is always poor quality, calling a phone on an Orange network is clear.

Personally, though I know little about these matters, it seems to me that the buzzing is like a "detuned radio" - and that the E200 is not able to "tune" properly on some networks. Could this be a possible explanation? Perhaps if we can identify this as a pattern then we can help Orange find a solution?

Ian