I work for (Major Phone Company). There are certainly times when any given number can only be called from inside a city (and not from outside), or from outside (and not from inside), or from one cell company and not another. The three main causes, equipment issues usually corrected pretty fast (great effort, sometimes against great obstacles, rarely more than a few hours, sometimes a few days if the whole city is still underwater), the ability to take a number with you to another company, which means every other company has to program equipment to deliver the call to the new company, not to the company the number looks like it belongs to (common for some companies to lag a day to a week to update databases), and when the trunks that deliver calls from one company to another fail, phone companies on each end of a wire of fiber like to each claim the other is at fault. The repairs are expensive, so if it might be the other company's problem, why throw my company's money at it? If everyone waits for someone else to prove where the problem is, nothing gets fixed for a while.
Still like Charlie Chaplin's 1940 talkie "The Great Dictator"; had to abandon it as the inspiration for the theme of my Ural's paint scheme. People can't seem to tell satire from support. Too much public education.http://en.wikipedia.org/wiki/The_Great_Dictator
2011 Gear Up from V.T. CYCLES, Pwr Arc Ignition, sprayed USMC 383 Green w/blacked engine/exhaust