Verizon, the largest wireless phone company in the U.S., last week confirmed that data belonging to about six million of its wireless customers was exposed after the information mistakenly was allowed to remain unprotected on an Amazon cloud server. The disclosure follows reports that an engineer at Nice Systems, which provides workforce management technology to track call center performance, allowed the data of 14 million Verizon customers to reside on an Amazon Web Services S3 bucket.