Did you ever have a look at the excellent #documentation of #Purism products?
One of the products of Purism is the #Librem5. The Librem 5 is a #Linux phone that runs the #PureOS operating system.
This phone is built up from the bottom to provide #privacy and software #freedom. No #surveillance by the manufacturer, free and #opensource (#FOSS) is their standard.
I use a Librem 5 as my daily phone.