It's not a problem with the phone. It's because there is no space. The phone is awesome and I love it but I found this a big problem for me too until I managed to solve it. It's just the limitations of the status bar jot having space. What u need to do. Is have pct batt to show in the bayy status rather than on the side. Have your mobile network name removed and just show signal strength. Remove data transfer speed display. Now u have enuff space on the status bar. Now all my WhatsApp small icon appears when new msg comes. Or any other app icon notification appears on top now.
Best answer by Danp
Network speed and provider disable done via Settings, display, more display settings.
Battery % is Settings, battery, cog top right