Some apps, such as Gmail and Calendar, have separate synchro- nization settings that provide more fine-grained control. For ex- ample, to control message syncing in the Gmail app, ensure you’re viewing your Inbox, then touch Menu > Label settings > Sync messages.
Configure auto-sync for all apps
To control Anto-sync for all apps that use it, open Settings > Data usage > 
Menu and check or uncheck Auto-sync data.
If you turn off Auto-sync, you need to sync manually to collect messages, email, and other recent information, and won’t receive notifications when updates occur. For example, changes that you make in your People app are automatically made to your Google contacts on the web.
If this option is not checked, you may be able to use an app’s tools to sync data manually. You can also sync manually to collect mes- sages, email, and other recent information. Leaving Auto-sync off can help extend your battery life, but will prevent you from receiv- ing notifications when updates occur.
Configure Google Account sync settings
To adjust a single Google Account’s sync settings:
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