When dealing in Soviet relations, President Reagan impressed upon a generation the mantra, "Trust, but verify." Decades later, this skeptical method is being applied to mobile carriers thanks to RootMetrics' Cell Phone Coverage Map, a crowd-sourced application aiming to provide reliable, verified information on network availability and performance. The app, now available to iPhone and Android users, provides a convenient way to determine which provider has the best signal in your area, and also happens to be great for spite, if you felt a coverage map wasn't telling the full truth. Yes, let's get it out of the way right now -- Root collects your stats and then sells it to the networks -- though given the purpose of the service, we're inclined to let criticism pass on this one. If you're undeterred by that caveat, hop on the bandwagon and share your results for the benefit of all (even if your battery doesn't thank you).