>>13906341It depends, depending on exactly what you mean. If they collide in the air, the individual packets are probably dropped. In general, data that collides and degrades beyond use simply doesn't get read. If it's an issue, the router or what-have-you will request the packets again, while most cellular devices will just give a brief skip in the conversation. In the extremely unlikely case of two devices and their signal perfectly cancelling each other over an extended period of time, similar to how noise cancelling headphones work, the devices will report a failed connection.
>>13906392Easy: they all receive it. The device will either route the message onward or ignore it, depending on design and protocol.
>>13906356>Your smartphone is not sifting through millions of packets to find the one that is meant for it.It actually kind of is. At least with 4G, a single "master signal" is broadcast containing the entirety of that area's data. I forget how 3G and 5G do it, but with the later, I assume it's similar. This is also what SIM cards are for: to make locating a target phone easier, so the total data being broadcast can be trimmed down, and the process (ideally) made that much faster.
