Huh? What kind of answer is that? Did you actually read the OP's question? Did you just make that stuff up because you think it sounds good, because it makes no sense at all...and your answer is so full of mistakes I can't even begin to list them.
So you actually understand the question - the OP is asking why they don't get any notifications while on the mobile network, why they only get notifications while on WiFi. Your answer makes no sense and is completely contrary to the question, not to mention the fact that you are wrong in any case.
@ the OP, are you sure mobile data is actually enabled on your phone? Have you checked in the settings? Are you able to browse on Mobile data with WiFi off?