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My mom iPhone 7 when she makes a call on occasions she hear crackling on ear speaker what can we do ?

Reception/signal could be a contributor? Does this happen intermittently or on every phone call? Up to date on iOS?
 
Reception/signal could be a contributor? Does this happen intermittently or on every phone call? Up to date on iOS?
We up to dated to latest and at&t wants us to upgrade and out of warranty
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Reception/signal could be a contributor? Does this happen intermittently or on every phone call? Up to date on iOS?
Also intermittent
 
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