It looks like someone managed to install the postmarketOS with the MATE desktop environment on the PinePhone Linux phone. Check it out!
KDE’s Plasma Mobile is progressing quite well and it looks a very good alternative to Android on the PinePhone open source Linux phone.
UBports is making great progress on porting their Ubuntu Touch mobile OS for the PinePhone Linux phone. Calls, SMS, YouTube, and OpenStore are all working fine.