Disgraced “Pharma Bro” Martin Shkreli is kicking back in solitary confinement amid allegations he was running a business from prison using a contraband cellphone, according to a report.

Shkreli has been sequestered alone in a special housing unit at the Federal Correctional Institute in Fort Dix, NJ, since a Wall Street Journal report last month that he was operating his business, Phoenixus AG, from a cellphone while incarcerated, Forbes said.

The 36-year-old is serving a seven-year sentence following his 2017 conviction for defrauding investors.