1.- When you the phone is lock and use the camera fats option the camera never appear only black screen.
2.- Also when you write a number and try to edit you can't do you have to erase all the number to write again, many phones can edit the number when you call except Iphone is a basic thing and useful
3..- when you have a call and go out to answer a whatsapp for example the phone put you aug of screen in main menu
4.- when use the phone in internet or emails some time the rotation screen don't work propperly you need come out from email or application to main menu and back again
5.- Loss of cellular service and wifi connection is very bad now take long time to connect even if you restart the parameters
