The towers broadcast a “can you hear me?” signal and all the phones reply “yes!”
The towers are all talking to each other through the internet, and so it doesn’t matter if 3 different towers can hear u/Hasanatir. They figure out which tower can hear you loudest, and that tower takes responsibility for talking to you.
And they repeat this calculation all the time, so when you’re on the highway, the towers pass responsibility as you drive.
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