Why sound from my s8 ear speaker is crackling while using sim slot 1 ?

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Android Central Question

Whenever i put my sim in slot 1 then sound from ear speaker while calling is muffled or crackling but when i put my sim in slot 2 then ear speaker start working normally
 

justnivek

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Jun 1, 2015
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Is it the same sim going from slot 1 to slot 2 or is it different Sims?

if it's the same sim there is definitely something wrong with your phone and I would take it to Samsung (or an authorized repair shop)

if it's a different sim in slot 2 then the sim from slot 1 needs to be exchanged for a new one perhaps