Comparison sites walk you through call bundles, off-peak windows and a loyalty discount that expires the moment you notice it.
The tariff has a loophole: a call is billed when it ends, so never let it. Ring your mother, say hello, and rest the handset on the sideboard for the rest of your life. Field notes from a 14-month trial: no bill arrived, and Mum went quiet by week two, though technically she never hung up either. The provider rang to check on us, but the line was busy.