Dual-screen smartphones aren't science fiction, they're real. There are cheap and expensive ways to add an extra screen to the back of your smartphone. One method is to buy a foldable phone and use the cover screen as a rear display, which is helpful for taking selfies or shooting video. Another, more accessible, way is to buy an external MagSafe selfie screen that works with the phone you already have and costs less than $100. I didn't do with either of those familiar routes — I paid $70 to add a 5.9mm e-ink display on the back of my smartphone.
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