Don't think that widespread cellphone surveillance is the sole province of big nations like the US and UK; apparently, it's within reach of just about any country with enough cash and willing carriers. The Washington Post understands that "dozens" of countries have bought or leased surveillance tools that let them track phones around the world with relative ease, so long as providers cooperate. The software exploits poor security in SS7, an inter-carrier network, to get your rough location by plugging in your phone number. With enough queries, suspicious governments (and well-connected gangs) can easily find out where you're going, whether you're in town or on the other side of the planet. To make things worse, these systems are frequently paired up with StingRays and other devices that can both get more accurate positioning and intercept phone traffic.