The Spare One is just that a spare cellphone that runs on a single AA cell and does nothing more than make calls. If left switched off, it can last for up to 15 years (or the time before the battery inside decides to burst and spread its toxic innards everywhere).
Actually, it does two things: you can also use the Spare One as a flashlight.
Its a fantastic idea, and perfect as an emergency phone even for those who dont regularly carry any phone at all: the Spare One will make emergency calls without a SIM card inserted. For regular use, you just pop in your SIM, power on and go.
