Why push the iPhone is not connected to the network can use the case

Why push the iPhone is not connected to the network can use the case?
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iOS has wifi sleep policy in mobile data and wifi are turned on, turn off the screen after a period wifi off automatically to save power, pushing away the mobile network.
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Official Android system is not such a mechanism, the domestic third-party push service seems to have only one push (www.igetui.com) made such a mechanism, the last in a meeting listening to their technology say.

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Networks are shut, and push what ah
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No network is impossible to receive push, because only Apple's app with APNS stay connected to receive push, you said the situation should not exist, you can remove the SIM card, and then close the wifi, push them, absolutely close Less than
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Push a network and local push. You should be the local news.
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Local push it. No network also how to push
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No network how might send out! You push the wrong