I definitely have had doom scrolling dreams as I fall asleep. Similar to Tetris effect.

I very rarely remember my dreams but I definitely do remember that once a long time ago I did dream of making a forum post from my smartphone. So the premise is not correct for all people.

had a dream recently where i was trying to take someones details in my phone but it wouldnt load the app and the keyboard kept fucking up as they were getting impatient with me. thanks brain, you son of a bitch.

It's because it's something constantly in flux. You don't have an unconscious model of "a phone", because you've changed out your handset so many times that you're not inherently comfortable with the sensation. And because they're information displays, they don't form an unconscious impression.

Read this yesterday, went to bed, dreamt about phones.

Genuinely, i was just dreaming about a new phone i was looking to buy.

Linklater's Waking Life touches on this, describing digital clocks and such not working in dreams, iirc.

Dreams are the brain trying to solve problems it couldn't solve during the day. Phones are nightmares we're forced to entertain during the day. Does the heroin addict dream of hot spoons and needles or the way they feel when high?

I have dreams with phones all the time. I dream that I type something, I look at the keyboard for a second, and when I look back at the text box I realize I made a mistake and have to rewrite most of the text.

It helped me realize I already experienced a quirk of the brain while dreaming, that I found about some time after I started having this recurring dream: if you look at a text while dreaming, then you look away and then back at it, the text will change.