Cellphone dead zones, dropped calls, website pages that load very, very, very, very slowly … one day soon, communications companies say, those frustrations will be as outdated as landline telephones.

Customers are straining the wireless network with smartphones in their hands, tablets in their briefcases, smartwatches on their wrists and a growing “Internet of Things,’’ where the latest cars, cameras, even refrigerators, require wireless connections.

According to the U.S. Centers for Disease Control and Prevention, 49.3 percent of households last year had a wireless phone, but no landline telephone at home.

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