Was flying today, and realised during MH’s new (and very-hard-to-follow) safety briefing video that they now ask that all electronic devices specifically including mobile phones be switched off for takeoff and landing. I also saw one person be advised by a crew member to turn the phone off when they had it out (I would think it was already in flight mode).

When did this become a thing, not just setting your phones in flight mode? Is this MH only, or something from MAVCOM for all Malaysian carriers?