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Channing Tatum stars in writer-director Derek Cianfrance’s biopic Roofman , about the real-life Jeffrey Manchester, premiering Sept. 6 at the Toronto International Film Festival

Currently serving a sentence in a maximum security prison for various robberies, Manchester shared his story via phone with Tatum and Cianfrance as they developed the movie

Tatum tells PEOPLE that he would take Manchester’s 15-minute calls “wherever” he was, including mid-conversation with his daughter Everly’s teacher

Channing Tatum spent quite a bit of time on the phone with an inmate at a super-maximum security prison to prepare for his new movie.

Roofman (in theaters Oct. 10) stars Tatum, 45, as real-life convict Jeffrey Manchester, who became notorious for robbing 45 McDonald's restauran

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