Verizon was the biggest advertiser during NFL telecasts last season, according to iSpot.tv. In its 10th season as the league’s wireless partner, the brand spent $201.5 million from the start of the regular season through the conference championship games. Insurance companies made up the Nos. 2, 3 and 4 slots, although none of them were an official league sponsor. NFL broadcaters generated $5.325 billion in ad spending during the regular season and playoffs, excluding the Super Bowl.