Pinephone owners who would like to upgrade the mainboard may be interested in this intriguing news in Pine64's October update:
"...3GB/ 32GB PinePhone mainboards will be available in the Pine Store in November. If you already have a PinePhone and want to upgrade to the higher capacity and RAM variant, you donโt have to buy a new unit โ just the mainboard. We also have a little token of appreciation in store for early adopters (Braveheart and UBports CE) owners who wish to upgrade their mainboards, but I wonโt spoil the surprise in this post."
https://www.pine64.org/2020/10/15/update-new-hacktober-gear/
Edit/Update: https://pine64.com/product-category/smarphone-spare-parts/?v=0446c16e2e66