Southgate News reports on a cellphone design that uses power harvesting to minimise power consumption. I suspect this is a "proof of concept" project rather than a practical design. Clearly, it requires a major name to introduce power harvesting to minimise power usage. Most cellphones use milliwatts or even watts of power on TX.
See http://southgatearc.org/news/2017/july/battery-free-cellphone.htm#.WWT3UrpFxMs
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