WASHINGTON—U. S. government agencies from the military to law enforcement have been buying up mobile-phone data from the private sector to use in gathering intelligence, monitoring adversaries and apprehending criminals.

Now, the U.S. Air Force is experimenting with the next step.

The Air Force Research Laboratory is testing a commercial software platform that taps mobile phones as a window onto usage of hundreds of millions of computers, routers, fitness trackers, modern automobiles and other networked devices, known collectively as the “Internet of Things.”

SignalFrame, a Washington, D.C.-based wireless technology company, has developed the capability to tap software embedded on as many as five million cellphones to determine the real-world location and identity of more than half a billion peripheral devices. The company has been telling the military its product could contribute to digital intelligence efforts that weave classified and unclassified data using machine learning and artificial intelligence.

The Air Force’s research arm bought the pitch, and has awarded a $50,000 grant to SignalFrame as part of a research and development program to explore whether the data has potential military applications, according to documents reviewed by The Wall Street Journal. Under the program, the Air Force could provide additional funds should the technology prove useful.

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