In short, there is very poor signal reception inside the building. As a phone, it is practically unusable in a building, apartment or large store.
I tried various settings but nothing worked.
I also have:
redmi note 4 - sailfish os (community port - pigzz)
One plus one - ubports
None of them have a signal problem, even in the basement they have a signal, where the Poco F1 with 0.14 e / OS / has no signal.
I read on the forum that there were problems with FP3, and that something was done about it. Does anyone else have a problem capturing signals from e / OS / ???