It is not like that, the phone needs a base that is the tool who maked the connection to the cell tower, that base needs electricity to work.
The phone just sends the audio from the microphone to the base so the phone is not portable since you would need to power the base if you want to make a call.
RE: New CellPhone needs NO battery! Africa needs this technology and @tj4real and @xpency should contact University of Washington who developed this new phone that requires NO battery and gets electricty FROM the celltowers or wifi router radio waves!