The short video embedded below shows LEDs being powered from the RF energy harvested from an iPhone operating in 2G mode. When the phone is called it is
M. Feghhi, M. Mirmohseni, and A. Abbasfar. (2014)cite arxiv:1411.3716Comment: Accepted for publication in International Journal of Communication Systems (Special Issue on Energy Efficient Wireless Communication Networks with QoS), October 2014.