I exclusively use a Nokia flip phone, and have never used a smart phone as my daily driver. Carrying around something with that much potential for addiction in my pocket at all times scares me, and I'd rather save my willpower for more important decisions. I see the occasional boredom as a plus - being comfortable while alone with just your thoughts is a skill worth practicing. There are definite downsides though, especially now with QR code reading being a staple of going out. I also don't like having to rely on others for navigation, google searches etc. (although the flip phone can do these poorly if required). I would recommend trialling a basic phone and perhaps keeping an old smartphone with no sim as a "work phone" for when you need it.
Looking at the extremes of the situation:
Interpolating from these endpoints, it seems that believing true things is not correlated to morality so much as moral agency.
As an aside, you can imagine a situation where you are omniscient and omnibenevolent, but live in a world without moral realism. If "truth" only includes information about what will happen, and not what moral theory is "correct", then you're still unable to make a moral choice.