Bandwidth-trading app challenges carriers Toledano, a 36-year-old master's degree candidate at the MIT Media Lab in Cambridge, Mass., has built an Android app, Air Mobs, which - were it ever released - would allow you to sell wireless bandwidth to a stranger near you in return for credits allowing you to buy bandwidth from another stranger in the future. Cell towers are expensive to install and maintain, and yet the more densely a carrier packs them, the more efficiently it can reuse the spectrum it has. [...] carriers have to find a balance between serving growing demand and keeping ... Read More