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I don't understand what you're saying. This is supposed to be a plan that you get. Basically you choose it, and then get a free call or lower cost. You have noises in the background anyways. Blurring them with something better isn't really disrupting the call?

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This smacks of subliminal advertising, it's not 'done', possibly even illegal, it certainly is in film and television advertising.

There are two sides to a phone call, a caller and a called person, afaik they both hear the same sound.

Advertising is by default subliminal.

Not necessarily true. Example: when your credit is about to expire, you get a notification that the other side won't hear. Two sides in a call can hear two different sounds.

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