The cell towers are heavily powered so the signals go out but how does my phone with a much smaller power source transmit the data back to the tower?
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Cell towers not only have more power to transmit further, they also have a larger antenna to receive signals better (the hint is in the name – tower).
If you think of it like people having a conversation. You can have two people with strong voices shouting across a room. But if one person only has a weak voice, the other person can have both a strong voice and big ears and they can still communicate.
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