Verizon said it was now handling an average of 800 million wireless calls a day during the week, more than double the number made on Mother’s Day, historically one of the busiest call days of the year. Verizon added that the length of voice calls was up 33 percent from an average day before the outbreak. AT&T said that the number of cellular calls had risen 35 percent and that Wi-Fi-based calls had nearly doubled from averages in normal times.

In contrast, internet traffic is up around 20 percent to 25 percent from typical daily patterns, AT&T and Verizon said.

The rise is stunning given how voice calls have long been on the decline. Some 90 million wired phone lines in the United States have ceased using landline phones since 2000, according to USTelecom. Wireless calls replaced much of that calling activity, but the volume of minutes spent on phone calls hasn’t changed much over the past decade as people turned to texting and to apps like FaceTime and WhatsApp, according to wireless carriers and analysts.