is it necessary of a 4G cell phone signal phone jammer?

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AndyWoods1900

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A new technology success will bring out another anti-technology. Same principle in the mobile phone area.
Everyone knows that the cell phone brings out great convenience for people.
However, it brings out some troubles in some aspects.
And now, the 4G signal is used in USA, so the same as the 4g cell phone jammer.
In some industries, do not affect with people's noraml life.
I think it is necessary. Do you think so? How about your opinion?
 
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