Machine Gun Kelly says Megan Fox thinks smartphones are 'a disease'

• Machine Gun Kelly was inspired to write his new movie "Good Mourning" by his fiancé Megan Fox.
• Fox sent him a cryptic text then vanished on a phone-free trip, causing him to panic.

Machine Gun Kelly said his fiancé Megan Fox "thinks the phone is a disease" on Monday's episode of the Armchair Expert podcast.

The musician and actor turned filmmaker, whose real name is Colson Baker, said he was inspired to write his upcoming debut film "Good Mourning" by Fox's aversion to smartphones and his inability to reach her while she was on a trip to Europe.

"That's exactly where the movie came from, dude," he told podcast hosts Dax Shepard and Monica Padman at the 57-minute mark. "Still to this day we'll go on trips and she won't bring her phone."

He continued: "She is very adamant—and she's not wrong — that the phone is a disease. So she is super good being like, 'I don't have any social media on my phone, I don't have any interest in what other people have to say.' That's why she always is so grounded."

He said when he "first started seeing Megan," the actress was "fine going a week without looking at her phone." He initially did not believe she was detached from her phone for "a long time" until he saw it for himself.

"You would be like 'oh can you do this' and she would be like 'my phone's at the house,'" Kelly said. His new movie is loosely based on an incident where Fox went "to Europe to evaluate Stonehenge" without her phone.

"She left and when she left she sent me this text," he said. Her choice to send the text before disappearing had him "driving myself crazy" and "scrolling up doing a full 'Da Vinci Code' to the conversation."

The singer recalled most of his friends giving him "terrible" advice, but his producer Travis Barker, who he recently collaborated with on his album "Mainstream Sellout," was able to help him relax after texting and calling Fox "a million times."

"She's a grown woman. If you're seeing each other, everything's good," he recalled Barker telling him.

"Good Mourning" is available in theaters and on-demand on May 20. See the full conversation below.