That's made by a Chinese company that breaks gpl by not releasing the kernel source. There are custom Roms for it but they're based on a binary blob that can't be adjusted.

I have bought it and i don't recommend. It like a heavy potato.

I had one. I loved it. But I overestimated my vision at my age lol

I got one for my wife. She used it for about two years, but it was a pain to read her messages. And if you increased the font to its largest size it looked like shit and you could only have 5 lines of text on the whole display.

It's nice, but you get tired of it. It was cool seeing the faces of people when paying with NFC.

I had one but only used it for 3 months due to its poor software. Its way to small, my eyes were hurting using that thing.

I have one as a secondary device, for the most part it's an mp3 player that can call and text, I'd use it more if Signal let me install on two phones, but its nice to carry around and has a headphone jack.

At 19mm thick, that is not a small phone at all.