I was involved with a open source phone OS and things went great - until we tried to take it to market. In order to launch the OS we decided to partner with telecom providers, and it was their requirements which threatened the project’s integrity. I fear this barrier will be present for other phones in the future. Open source hardware is really important. The closed source baseband blob compromises the security of the device. We were unable to audit it, so we could not trust it.