There's crowd-sourced information here:.
Local broadcaster WNCN has other information here:.
Their report leads off with "RALEIGH, N.C. (WNCN) - An accidental fiber line cut caused widespread outages of cellular service for cellphone providers in central North Carolina for nearly seven hours Monday ... ."
More by fishing with "Raleigh Verizon cellular outage" as bait.
HTH. Cheers, -- tlvp