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Mobile Minutes: FCC, FTC investigate device security; Periscope adds search; Spotify grows; Digital assistants

The U.S. Federal Communications Commission and Federal Trade Commission on Monday wrote to Apple Inc., AT&T Inc., Alphabet Inc. , Sprint Corp., Verizon Communications Inc. and others, enquiring how they release security updates amid mounting concerns over security vulnerabilities, the agencies said.

Each day, people collectively watch the equivalent of more than 100 years of live video on the Periscope app. Good luck trying to search through it all?there is virtually no way to do so.

Spotify is unleashing a dozen original music-centered shows, as the streaming-music giant looks to bring a new wave of content ? and advertising ? to listeners.

You may already be on a first-name basis with Siri, Cortana, Google or Alexa, the Fab Four of voice-activated digital assistants. Now that relationship is expanding from one device (typically a smartphone) to many.