This battery-free cellphone runs on light and radio waves



Who cares about an OLED and a notch when your phone can sip power from its surroundings, allowing you to make calls without ever having to charge your phone.

This wild cellphone is part of a Google Faculty Research program and received three U.S. National Science Foundation grants for total investment of about $2 million. For that money, the creator, Vamsi Talla, built a single-board cellphone that can make regular phone calls connect you to emergency services. The team is commercializing…

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