Low power transmitters sending signals back to huge antenna on towers.
If you can talk one way, you can talk the other.
In actual fact, I think you’ll find that mobile phones broadcast “stronger” for their signal than the relative portion of their signal coming from the tower. The tower is more powerful overall because it’s talking to hundreds of phones, but individually the phones are putting out more energy to talk to the tower than that tower did to talk to them.
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