Really like the one-handed phone form factor, but the Box Palma being WiFi only was a deal breaker for me.
Instead I got a Hisense A5 from eBay for ~$130 and after rooting, debloating, and installing E-ink optimized versions of Open source android apps it's a perfect companion for my Boox Nova Air C. With KOReader syncing across devices.
An e-ink phone is an interesting idea! I’m guessing the battery life is great.
There's one called the Light phone and the battery life is below average. The screen is definitely a hog but cell radios can just as easily chew through the battery.