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I have noticed that when I'm at home, the WiFi icon is always gray, so I cab still have access to the internet but notifications from apps like whatsapp, Facebook, etc doesn't, work. When I connect to another WiFi network like the one on my job, the icon turns to blue and notifications work as expected.
I think the problem may be on my internet at home, but how can I fix this?
UPDATE There are some strange things i noticed: It's only this specific phone that does not receive push notifications. I tested with my brother's phone and with one of mi friend and they both receive push notifications... so the problem happens ONLY at home and ONLY with this specific device.