I can't see why mobile networks don't charge line rental in return for cheaper calls, just like landlines. That would be a much fairer way of doing it
Is everyone here on PAYG mobiles!!
Isn't that exactly what contract mobiles with inclusive minutes actually do. The line rental is varied according to whether you want to call friends on different networks, or friends on the same network/landlines, and whether you want to call daytime, or off peak, and also varies according to the quantity of minutes as well.
As an added plus, you can avoid paying the full price of line rental by opting for a not so up to date mobile (after all, if you only want to make and receive calls, and not bothered about cameras and radios) then the shop rebates nearly 12 months of the line rental. After the 12 months are up, you have a phone that can fetch a few quid.