Слушаю на курсере Startup Engineering, сейчас делаю assignment, они предлагают сделать кикстартер для своего продукта и как один из примеров предлагают это:

Secure phone. A Linux based, completely open sourced phone which gives feedback (via blinking red, vibrating, etc.) before transmitting any kind of signal that could be wiretapped. Kind of a Geiger counter for the NSA. Market: any foreign country (e.g. Russia) which is concerned about information security. This concept is a bit of a lark but could be surprisingly huge if one could also deploy it as a background app on existing smartphones (which would essentially blink red, vibe, etc. all the time).

Неплохая идея для криптопараноиков же.