Push notifications are a lot smarter than when Apple first rolled them out in iOS 3.0. Push notifications can be sent without the app requiring the user’s contact information (note that the app must first ask the user for permission in order to send push notifications). If you have installed the app and have enabled push notifications, they can be sent by the app publisher at any time. An app publisher can only send a push notification if the user has their app installed. They can appear on a lock screen or in the top section of a mobile device. Push notifications are messages that can be sent directly to a user’s mobile device.
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