LOL what a nice way to raise mobile phone manufacturers profit and all disguise in care about ecology and some mumble about greenhouse gases. It's as effective as live stock number reduction in favor of deforestation of amazon jungle to plant more soya and make us all veggies instead of that methane producing cows.

Transfer cellies to oled(amoled) displays, make rechargeable batteries more durable and improve capacity few times. Move cell repetition towers to further distances with one tower covering up to 300 sq mile area operating radius, improve encoding scheme for plain voice services. Force regulations for operators to equally share same antennas while keeping separate network equipment would be way more ecological than this.

But hey after all we'll get simpler highly efficient chargers (from inefficient smps ones we use to have??) as they propagate with just a decade delay