Self-compiled Android without Google services is not a bad place to start.
That said, these single-vendor proprietary mobile platforms are all dumpster fires so it may be time to start developing a free software alternative.
That said, these single-vendor proprietary mobile platforms are all dumpster fires so it may be time to start developing a free software alternative.
No one produces an LTE modem with open source firmware.
It was decades before the PC's we used to build FreeBSD, GNU, Linux etc. had even a free software BIOS available.
Historically, free hardware availability has followed in the wake of free software.