Sync contacts with your phone
Depending on the phone you're using, you might have different default sync settings. Most phones synchronize with your My Contacts group by default, but some sync with other groups as well. Learn more about default contact groups and editing your groups.
Remember: Synchronization goes two ways. If you delete contacts from your mobile device, those contacts will be deleted from your Google Account. If you delete a contact accidentally, you can recover that contact's information within 30 days of deleting it.