Sync contacts across iPhone, Android, Google, iCloud, and Outlook. Choose one account, turn on contact sync on each device, and fix duplicates.

To sync contacts across your devices, pick one account to hold them, such as Google or iCloud, and turn on contact sync for that account on every phone and computer you use.
Once sync is on, a contact you add or edit on one device appears on the others. The detailed steps are below.
Most sync problems come from keeping contacts in several places at once: some on the phone, some in Google, some in iCloud, and some in Outlook. Choose the account you use most:
| If you mainly use | Keep contacts in | Then |
|---|---|---|
| Android or Gmail | Google Contacts | Sync your Google Account on every device |
| iPhone and Mac only | iCloud | Turn on iCloud Contacts on each Apple device |
| iPhone with Gmail at work | Google Contacts | Add the Google Account to the iPhone and turn on Contacts |
| Classic Outlook | Export to Google or iCloud | Export a CSV file from Outlook and import it |

To sync right away, open the Contacts app and pull down on the contact list.
Contacts saved only to the phone may be labelled Phone, Device, or Local. They aren't in your Google Account until you move or back them up. Google's sync help for Android has the details. It also warns that turning off Google Contacts sync removes the contacts from the device, and changes that haven't reached Google are lost, so sync manually before you turn it off.
If contacts don't sync, go to Settings > Contacts > Accounts, tap your Google Account, and check that Contacts is on. Google also recommends checking Account > Advanced > Use SSL, then adding the account again if needed. See Google's sync help for iPhone and iPad.
Sign in with the same Apple Account on every device. If a device isn't signed in, or Contacts is off on it, it can't show your iCloud contacts. See Apple's Set up iCloud Contacts.
Classic Outlook can export contacts to a CSV file:
Microsoft's Import or export contacts in Outlook using a .csv file covers the details, including new Outlook. Then import the file into Google Contacts with our guide to importing contacts into Google.
An export is a one-time copy, not a sync. After you import, choose one place to edit contacts from then on.
Duplicates are common after you combine lists. In Google Contacts on a computer:
You can't merge contacts saved in different Google Accounts. See Google's Merge duplicate contacts.
A synced address book tells you who someone is. It doesn't show where a deal stands or who on your team is following up. If you sell from Gmail, Sales CRM by Tooling Studio can import your Google Contacts and add organizations, deal stages, owners, notes, and tags, so the team shares one view of each customer. See the Google Contacts CRM guide for the setup.
Before a big import or merge, export a backup of your contacts. See how to export contacts from Gmail.
Usually the Google Account isn't added in iOS Settings, or Contacts is turned off for it. Go to Settings > Contacts > Accounts, tap your Google Account, and turn on Contacts.
Neither Apple's nor Google's help describes automatic two-way sync between iCloud and Google Contacts. Choose one as the main account and use it on every device.
It can, especially when the same people are saved in two places. Use Merge & fix in Google Contacts after the first sync.