Replying to my own post here (the shame!) but it's relevant and hopefully slightly interesting: You can purchase SIM cards from most supermarkets in the UK fo

Replying to my own post here (the shame!) but it's relevant and hopefully slightly interesting: You can purchase SIM cards from most supermarkets in the UK for around the £1-5 mark and a basic Nokia handset for £10-15. You can top these up using cash at any supermarket checkout with "topup vouchers". If you top up £15 that gives you 100% unlimited O2->O2 calls and texts for a month. I reckon with a one time pad system such as the one described at [1], it is the most reliable, anonymous, secure point to point country-wide messaging system that you can create and it's not expensive or complicated. I might write the whole thing up as an experiment and hopefully I won't get chucked in jail for doing so! [1] http://users.telenet.be/d.rijmenants/en/onetimepad.htm http://users.telenet.be/d.rijmenants/en/onetimepad.htm