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Tawkon, the smartphone app that claims to measure the amount of radiation emitted from your phone, has taken a look at the so-called "death grip" on Apple's iPhone 4 and determined that it does more than just hurt reception levels - it might be hurting you.

The task of running a cellular network has usually been reserved for major carriers. But now an open-source project called OpenBTS is proving that almost anyone can cheaply run a network with parts from a home-­supply or auto-supply store.