I have Nokia Lumia 620 with Windows Phone 8.1 installed. The FB Messenger app works fine I can say, and sometimes the notifications (when I receive a message eg.) are showed up in real time. But most of the time they are not real time, and for example I get a notification of a message 1-2 hours after it was really sent (especially if I have not used my phone for a while). The (late) notification usually shows up when I unlock my phone. I would LOVE to see fb messenger's notifications becoming more precise and more reliable.
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