What does a push service on a cell phone do?

Push (Push Services) is simply the ability to push a message to the notification bar of a cell phone, or to the top right corner of an app with a corner marker, regardless of whether or not the message is wanted (in the case that the user agrees to receive push notifications of messages from the app). Push allows the app developer to send the message they want to convey to the user in the first place, because many users don't actually know how they need the information.

iOS push (APNS) relies on one or several system-resident processes to operate and is global (taking over the push of messages from all apps), so it can be seen as independent of apps, and is a communication between the device and the Apple servers, rather than the app's provider servers.

Tencent QQ's servers (Providers) send notifications to Apple's corresponding servers (APNs), which are then relayed on top of your Devices. When you receive a notification and open the app, you start receiving data from Tencent's servers, which is the same as what you saw in the notification, but through two different channels.

And Android, on the other hand, is different, more like a traditional desktop computer system. Each app that needs to be pushed in the background has its own separate background process that communicates with its own server and exchanges data. In addition, Android also has a GCM (Google Cloud Message), which is similar to APNS, and is optional, not mandatory, for developers.

To learn more about mobile push services, go to Aurora, which is relatively simple to use. Users register an account and then choose to create an application, upload the application name and application package (iOS applications need to upload the iOS development certificate and certificate password) to complete the creation. Enterprises wanting to push messages only need to select the app, click "Send Notification" in "Push", fill in the push content and click "Send Now" at the bottom of the page.