A Tennessee company will stop selling personal cell phone records of individuals over the Internet and will provide information on how it acquired such data under an agreement reached last week with Verizon Wireless.

The firm, Source Resources Inc. of Cookeville, Tenn., was among dozens of companies advertising that for fees starting under $100, they would provide records of calls placed to and from any phone user.

Call records frequently are used by law enforcement, which obtain them through court orders. But small data brokers and private investigators have made a business of getting and selling the information online, often acquiring the information using deceptive or illegal practices, according to experts.