Right now postmarketOS is a touch-friendly operating system based on Alpine Linux that runs on a handful of devices including the Samsung Galaxy Nexus, Google Nexus 4, 5, and 7 (2012), and several other Samsung, HTC, LG, Motorola, and Sony smartphones. There are also ports for some non-Android phones such as the Nokia N900 and work-in-progress builds for the BlackBerry Bolt Touch 9900 and Jolla Phone.
Note that when I say the operating system runs on those devices, I basically mean it boots. Some phones only have network access via a USB cable, for instance. None of the devices can actually be used to make phone calls.
But here’s the cool thing: the developers are hoping to create a single kernel that works with all supported devices, which means that postmarketOS would work a lot like a desktop operating system, allowing you to install the same OS on any smartphone with the proper hardware. You might still need a bit of custom code for each device, but a shared kernel should make porting postmarketOS to new devices a lot simpler.
