With automatic syncing enabled, your contacts will be synced in the background while your iPhone is idle or while you are using other apps.
To enable auto sync, go to Contacts Sync > Sync, select "Auto," and choose from one of the following sync types:
- Off: Disables automatic syncing
- 2-Way Sync: Syncs changes in both directions, updating both iPhone and Google
- Google Contacts -> iPhone: Updates your iPhone contacts with the latest changes from Google
- iPhone Contacts -> Google: Updates your Google contacts with the latest changes from iPhone
For best results, you can enable "Location Assisted Sync" so that your iPhone can auto sync your contacts whenever you visit a new location. See this article for info:
You can review past automatic syncs by going to Contacts Sync > More > Sync History.
Read about the other auto sync settings at: https://playaapps.zendesk.com/hc/en-us/articles/226334207-Auto-Sync-Settings
For help troubleshooting auto sync, please see this article: