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I implemented push notification system and I noticed that push messages do not ever come when I am on 3G or 4G (mobile Internet).
When I connect to wifi, they come regularly.
Is this behavior bound to Android OS or we can write a code to change it?
If you see the same behavior with stuff from Google (Gmail, Google Play app updates, etc.), then the problem lies with your phone or carrier. If the Google stuff works (they use what amounts to GCM), then your problem lies with Parse.com and whatever the other apps are using for push.
GCM (and the C2DM precursor) work over mobile data or WiFi. It is a bit tricky to implement a push system as a third-party library, which is why I recommend firmware solutions (GCM, Amazon’s just-announced Kindle Fire equivalent, etc.). In particular, maintaining a mobile data connection to the push server, with enough heartbeats to keep the connection alive without really draining the battery, is difficult to get right, particularly given subtle mobile carrier or device variations. Google has more experience with this than do most firms, and Amazon only has to worry about a handful of Kindle Fire models.