JPMorgan Chase CEO Jamie Dimon adheres to a strict “smartphone rule” during his workday: if you need him, do not send a text or email. The billionaire banker says he rarely carries his mobile phone during business hours and actively avoids digital distractions to maintain 100% focus during meetings. He added that if people want to reach him and it’s important, call his office and they will find him.

No notifications, no distractions: Dimon

Speaking in a recent interview with CNN, the head of America’s largest bank confirmed that he generally ignores digital communication while working. Dimon’s policy applies to nearly everyone, from executives to high-profile figures, with the exception of his immediate family,“I don’t have it in front of me all the time. If you send me a text during the day, I probably do not read it,” Dimon stated, adding, “I don’t have notifications; the only notifications I get [are] from my kids, that’s it. When they text me I get that.”Dimon, who has three daughters, explained that anyone needing him urgently should use traditional methods:“People don’t call me on the phone that much, they tend to call my office… When I’m walking around and going to meetings I don’t have it on me, it’s in my office. If you need me and it’s important, call my office, and they’ll come get me,” he said.He attributes his success in meetings to this approach, noting that he can be completely focused on the conversation, “as opposed to, ‘I’m distracted and thinking about other things.’”

Focus is ‘non-negotiable’

Dimon’s mobile phone rule is part of a broader argument against workplace distraction and in favor of mandatory presence. He previously addressed the issue at the Fortune Most Powerful Women Summit, where he warned employees about digital device use in high-level discussions.“If you have an iPad in front of me, and it looks like you’re reading your email or getting notifications, I tell you to close the damn thing. It’s disrespectful,” he told the audience.Dimon also talked about this in his annual letter to shareholders, stating: “I see people in meetings all the time who are getting notifications and personal texts or who are reading emails. This has to stop. It’s disrespectful. It wastes time.”