Cellphone tracking: a matter of protection or loss of privacy?

With the right equipment, anyone can trace where we are through our phones. Whether and how this technology is used has been a source of controversy for years.
One of the latest flare-ups is police use of Stingrays. In this context, it's not a type of fish but the brand name of an International Mobile Subscriber Identity tracking device.
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Cellphone Tracking: Protection vs. Privacy