Tesco Mobile have launched their new 'Lite Tariff' in response to Asda Mobile's cheap rates. It could be good for low mobile users, particularly those who get better reception on O2 (Tesco) than Vodafone (Asda). Also, you get triple Clubcard points for every £1 you top up on Tesco Mobile. The data charges are a bit steep though!
Click 'Go to deal' to see the full list of call charges.