Linux on mobile?

I've got a Google Pixel 4a, which I bought quite a few years ago. Over the time I've had it, I have taken it apart twice: Once to replace a broken screen, and once to replace the battery and the USB-C port. I also run GrapheneOS on it. I've been using this phone daily and I am quite happy with it.

This is where the good story ends however. Today I woke up to the unfortunate notification that GrapheneOS reached end of life for the Google Pixel 4a. I am thinking of either continuing to use my phone, or convert it to a sole MP3 player and switch to a Fairphone. Either way, GrapheneOS is not supported and I need to look into alternatives.

Now, a while ago I've got myself a Thinkpad, on which I installed Arch (btw) and KDE Plasma. I am quite happy with my setup. And since I am confident in my Linux skills, I got the idea to just install Linux on my phone.

After 5 minutes of googling I've found that there exists Arch for ARM and KDE for mobile:

• https://archlinuxarm.org/
• https://plasma-mobile.org/de/

But I am hesistant to go down what looks like a rabbit hole. So before I commit, I want to ask you. Are you running Linux on your phone? What are your experiences? Do you recommend it?