Published every weekday, the Switchboard highlights five tech policy stories you need to read.

Second China army unit implicated in online spying.  The New York Times reports: "The National Security Agency and its partners have identified the hackers as Unit 61486, according to interviews with a half-dozen current and former American officials."

Amtrak’s upgrading its horrendous Wi-Fi. "In the near future, Amtrak aims to more than double its current Wi-Fi capacity in the much-traveled Northeast Corridor — an effort to address widespread complaints about getting online while onboard," I write. But there's a catch: You still won't be able to watch Netflix.

Senate satellite TV bill coming this week. The Hill reports: "This week, Senate Judiciary Chairman Patrick Leahy (D-Vt.) will unveil a bill to reauthorize the law governing satellite television, according to a committee aide."

A tiny technical change in iOS 8 could stop marketers spying on you. "The change in iOS 8 has wider ramifications because it doesn’t just affect developers who build iOS apps, but any company that uses the nature of wireless networking to identify a device," Quartz reports.

What a merged Sprint and T-Mobile would look like. "As the map shows," writes the New York Times, "both companies offer service in many of the most densely populated areas of the country. That means for customers in almost every major city in America — including San Francisco, Houston, Chicago and New York — the choice of wireless carriers will fall from four to three if Sprint and T-Mobile combine."