I live in farm country, and we still use CB's quite a bit, Although 'Push To Talk' seems to be making some large inroads into the communications around here.
Since we are in a 'Secondary Market', the cell phone companies don't have overlapping coverage, meaning if one cell tower goes down, we are screwed!
Lots of 'Dead' spots too.
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In the event of mass power loss, like hurricane, tornado, flood, ect.
(and we are in 'Tornado Alley' and just had severe flooding this spring, so it does happen)
The cell phone towers won't operate long on emergency generators simply because no one will be able to get to them to refuel them.
Home or vehicle based CB radios will have limited range, but do well for 'Fill In' communications, and unlike Cellular based communications, you aren't charged by the second and it's much more difficult to track the transmission than with a Cellular phone.
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Correct, Channel 9 is the 'Emergency' channel, but virtually no one monitors it anymore.