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Why can a small iPhone antenna reach cell towers miles away? Because of the asymmetric design of cellular networks. While your phone transmits a low-power 4G or 5G signal, the cell tower uses massive MIMO, beamforming, and uplink aggregation to combine multiple narrowband signals into a single high-bandwidth channel. This video explains the engineering behind cell phone antennas vs cellular tower antennas, how towers manage hundreds of simultaneous connections with signal aggregation in LTE and

How Cell Towers Actually Hear Your Phone’s Antenna