The FCC, the federal regulator in charge of telecom companies, said in a statement that Verizon "failed" to notify about two million new customers of their privacy rights, including how to remove themselves from having their personal information used in marketing campaigns.
The U.S. phone giant has now agreed to notify customers on every bill for the next three years their opt-out rights.
FCC's Travis LeBlanc said in remarks: "It is critical that every phone company honor its duty to inform customers of their privacy choices and then to respect those choices."
"It is plainly unacceptable for any phone company to use its customers' personal information for thousands of marketing campaigns without even giving them the choice to opt out," he added.
The regulator added that the Verizon fine is the largest such payment in FCC history for settling an investigation related solely to the privacy of phone customers' personal data.