content: Router is what I'd be MOST worried about, just because the vast majority of routers are used for years without ONCE getting an update. Flashing a routers firmware is not something the vast majority of people have any idea how to do. This means that once NSA and their ilk find a router vulnerability, they can exploit it for long periods of time, with very low chance of detection. Cellphones can be a more high value target when targeting a specific person (what intelligence agent doesn't get their manties moist at the thought of a microphone their target willingly carries everywhere?), but for more general surveillance, routers are low cost high benefit.