You can get a basic Nokia 1200 for £9.95 when purchasing £10 airtime virgin credit, it seems you can also get £10 back from quidco which makes it a very cheap mobile. Mobiles cant get much more basic than this so perfect for the technophobic .
So for the £19.95 you get £10 credit the mobile and £10 back via quidco. Total end spend £9.95. Effective cost £0.