Re: Coloured Zones
It's down to the telephone switch technology. Due to the fact that Virgin Media was originally was lots of different companies, then some chose different providers for telephony than others.
So depending on the switch technology used, the instructions for call features may be different, hence the different coloured zones
I think there is work going on at the moment to sort it all out, as some areas have moved zones over the last couple of years.
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