I have long wanted to say that the Xperia XZ2, not a good quality of communication, if you go down below the first floor. As it turned out, Xperia has a long-standing problem. That is, the phone most basic function it`s not implemented as must be.
I simultaneously checked the signal quality, with a nokia phone and my previous Lg G4 smartphone, and they, unlike XZ2, caught the signal without any problems, while the XZ2, even after I went upstairs, refused to catch the signal and i must be restart XZ2
