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Phone + linux distro with working VoLTE?
(www.malwarebytes.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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PostmarketOS, while certainly not production ready, does have mobile data working for some devices: https://wiki.postmarketos.org/wiki/Devices
There's also the upcoming Mecha Comet which has been able to make calls and use mobile data in testing but is yet to be released so we'll have to wait and see how usable it is.