My sister just got this phone 2 days ago. At first it seems to be a really nice phone and good value for money except that there's a major issue with push notifications for apps like whatsapp, Facebook messenger, viber, and the like. When the screen is off you get no notifications whatsoever from these apps. She has to check every app manually to know if she's got new messages. That's a really big problem considering how important social media apps are for people nowadays. I've tried several ways to fix this issue but nothing is working. Has anyone else experienced such problems?