As people across the country remain isolated at home due to the spread of COVID-19, Verizon has seen a huge spike in cell-phone usage, higher than peak times like Mother's Day or New Year's Eve. 

"We've had 800 million calls a day. That's double the amount of calls you would have on Mother's Day, which is the busiest [Sunday] of the year," Verizon CEO Hans Vestburg told David Faber on CNBC's "Squawk on the Street" on Friday.