How is it possible for multiple cellular carriers to broadcast from one tower?
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The “tower” isn’t a singular thing. Any given tower has a many different receivers/transmitters on it. Multiple providers can have equipment on the tower at any given time.
Now, if you are asking why those signals don’t conflict with one another, it is because the signals are _slightly_ different from each other – and that difference is enough for your phone to know the difference and the signals to not interfere with one another _too_ much.
It is like WiFi. We say that WiFi is at 2.4ghz, but that isn’t exactly true. Wifi has channels, and each channel is a slightly different frequency: Channel 1 operates at a center frequency of 2.412 GHz.
Channel 11 operates at 2.462 GHz. Those differences are enough to separate the transmissions and let each phone and tower operate on different networks, even when they are close by.
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