My ISP is Breathe. They operate a service called breathe freely. You pay £50 up front and you then get 24hour net access for free. You are limited to 6 hours at a time and get chucked out for 15 mins if inactive for 1 hour. I find the service very good and rarely have problems connecting.I have a second line as part of the BT together package and am now my bill is less for two lines than it was for one.