Hi. For some reason I don’t get messages from Whatsapp and other apps anymore when I am only connected to 3G. When I enter my home or office, where I have wifi, I suddenly get all the messages. They also show up when I open the app, specifically, even in a place with no wifi.
What do i have to do to get push notifications when I am off wifi?
Only just noticed your post, apologies if this is no longer relevant:
Have you checked under settings > data usage > [menu key*] whether you’ve somehow restricted background data?
*i.e. the left-most of the three hardware keys below the screen
There is also the possibility that you restricted only the background data of WhatsApp. To check this, go to System Settings -->Data usage–>[name of you SIM] --> WhatsApp and see if the box at the bottom is checked.