The only reason i have the VM phone is for incomming calls i have 100meg bb and tv and phone,works out i'm paying 2 pound a month line rental.If you have a unlocked mobile you should check out giffgaff 0800 numbers are free and you can enter a 0845 to see if there is a 0800 at this site
http://www.saynoto0870.com/search.php