A cell phone left behind on an MBTA train last year revealed an Everett man was once again handling child sexual abuse material. He now faces at least 15 years in prison, after pleading guilty to several charges in federal court, according to authorities.

Robert Sokolowski, 52, pleaded guilty to one count each of possession of child pornography; distribution of child pornography; and receipt of child pornography, according to a press release from the office of U.S. Attorney for Massachusetts Leah B. Foley and Michael J. Krol, special agent in charge of Homeland Security investigations in New England.

This is Sokolowski’s third federal conviction for child sexual abuse material offenses, authorities said, and the second time he was caught committing the same offenses months after being re

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