In recent events, I learned that some pagers only have receivers. How are discrete messages sent to these devices? How is it authenticated? How do they know the device got the message?
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Back in the ancient times when I got one we had to page the weed guy to get weed. We out our phone number + 420 (truly a mastermind of code no one would ever break) then he would page back with a time (ex 20) to roll through the burger king drive thru where he was the assistant manager. Then just ordered a whopper with extra lettuce (another brilliant code guaranteed not to get broken) then we just paid $10 more than the damn sandwich we didn’t want but would soon be fighting over.
