I read a web article the other day about alternatives to the market leaders in smartphone operating systems. ... Most of the examples listed, which included Linux kernels among them were strictly research and development and / or defunct. I am curious as to whether there are any ongoing efforts to create alternatives to the dominant smartphone environments, like Android and IOS. I am particularly interested in efforts to develop secure phones, phones that are hard to hack and that encrypt data, etc. I understand that there are certain kernels that are used because they are "lightweight" and I am also curious about efforts to build apps on top of these operating systems to create an environment that could compete with Google or Apple. So many projects got started and then were thrown aside... I am curious if there are any efforts moving forward as I write this in January of 2021.