I take the point but I would be suprised your broadband/landline package gives you "free" calls to mobile numbers? If it does, it would be unusual. I find increasingly that people only have a mobile number or call me from one so I use the included minutes with my BT SIM to call them rather than ringing them back from my landline. Using my BT landline to call mobile numbers is still prohibitively expensive in my opinion.
There maybe other providers in these days of unbundled telephone exchanges who offer something different but living in a rural area none of these is ever likely to find installing their equipment in the shed that doubles as our local exchange commercially interesting.
