On the topic fermi paradox, has anyone considered the answer might be radio telescopes aren't powerful enough to detect artificially made signals?
Recently astronomers detected the radio emission from an exoplanet for the first time. It was caused by interactions with what's believed to be a gas giant's atmosphere and it's parent star, who's magnetic field interacts with the atmosphere to create a very powerful beam of radio waves. That's the first time we've ever been able to detect radio waves from an exoplanet, and the emission source is orders of magnitude more powerful than all of our transmitters combined and required over 2,000 telescopes working across the globe to detect it. Also consider, we have trouble today, maintaining constant communication with the voyager probe, the furthest manmade object from earth and it's only located in the ort cloud.
So if we can't detect anything other than some of the most massive emissions in nature in other star systems, why would we be able to detect the cellphone traffic from that same star system?