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Well, beam formed a little since there was no point in a tower broadcasting upward. But the mobile phones are not beamed formed at all, so the question remains - Why does the tower need 100 watts power when the phone answering back only needs well under a watt?
Voice data isn't large in comparison to most of what we do on the Internet now, which is video.
The future of the internet in many areas will be from cell towers.
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Many others have attempted Open Source phones and failed. I hope this one works, especially since I just discovered that you cannot turn off wifi or Bluetooth on Android or iOS. "Turning it off" in the controls on those phones merely disconnects you from current access points, but leaves them on so they can spy on your location with great precision and open you up to various exploits:
https://www.theguardian.com/technology/2017/sep/21/ios-11-apple-toggling-wifi-bluetooth-control-centre-doesnt-turn-them-off