not tested yet..
There are some few white pixels (2 or 3 at this time).I guess it might be B grade because of that. In general, the whole design UMIDIGI F2 and similar new phones is one big mistake and next time I will buy simple phone instead of a repair. Simple means proven by users, flat display, independent LCD and digitizer layers, easy disassembling (no glue), and ideally a solid magnesium frame...