It's tough being AT&T, T-Mobile, or Verizon. When the Big Three aren't spending a fortune on spectrum or snipping cables to thwart hackers, they are usually in court fending off another lawsuit.Recently, they walked away winners in a case brought by Taiwanese electronics manufacturer Asus.Why was Asus after AT&T, T-Mobile, and Verizon?If you didn't think these companies belonged in the same senten…

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