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How does this interacts with FLOSS software used on the phone?

This is an example of "tivoization" and should be prevented by GPLv3

Do any phones use GPLv3 code? Closest that I know of is Linux under v2, but Android generally is permissively licensed.

The large majority of Android is Apache 2, rich requires attribution but no release of source code.

There's a good amount of software under GPLv3 on f-droid.