Volla Phone X23, Dual OS & removable battery
noypigeeks.com
Volla Phone X23 comes in two platform options. The brand’s own Volla OS & Ubuntu Touch, you can easily switch between operating systems using the multi-boot function.
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The issue I have with these alternatives is the compatible apps list is short. You may as well just flash your standard phone with LineageOS or GrapheneOS, atleast you can sideload some android apps on those where needed.
Any alt os tells me it doesn't run android apps I just stop listening.