Alternatively you could use a GNU/Linux phone (Librem 5 or Pinephone), which allows to freely choose the OS and supports ordinary mobile use cases. It is small, but if you connect a screen and keyboard, you get the full PC.

Between a T480, Librem 5, or Pinephone, I wonder which is most powerful. I have a soft spot for my Pinephone, but fast it is not.