feral_engineer t1_iyce81j wrote
Reply to comment by [deleted] in ELI5 Why can someone easily pick up other signals on a walkie-talkie, but you can’t easily listen in to cellphone conversations? by king063
Cell phones still use 800 MHz. When they transitioned from no encryption analog AMPS to encrypted digital D-APMS in 90s they made it possible to gradually transition to D-AMPS. And all subsequent technologies were designed to support gradual transition. They run 4G and 5G in the 800 MHz band these days.
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