Most people use iCloud to back up and sync data such as contacts, notes, photos, etc. on their iPhone and other Apple devices such as iPad, Mac or Apple TV. To sync contacts on iPhone 7/7 Plus/6s/6/5s/5 to iCloud, just open Settings and go to iCloud options. There, you can move Contacts to On and the iCloud backup feature on your device should also be enabled.
Sometimes iCloud sync doesn't seem to be as efficient as we think it is. Your contacts may not sync/update to iCloud correctly. Like this person described on the macrumors forum:
"I'm logged into iCloud and logged into my iPhone, iPad, and MacBook Pro (all updated). Not only are my devices not sharing contacts; iCloud (web) also does not show new contacts added from any device."
If you encounter the problem of unable to transfer contacts from iPhone 7/SE/6s/6/5s/5/4 with Don’t worry about iCloud sync issues, this post provides some potential fixes for you to try, and also introduces a way to back up iPhone contacts that doesn’t rely on iCloud or iTunes.
Fix iPhone contacts not syncing to iCloud
Method 1. Turn off "Contacts" on iCloud and reopen
Step 1. Click Settings on iPhone > [ your name]> iCloud. If you are using iOS 10.2 or earlier, tap "Settings" > "iCloud".
The second step is to turn off the iCloud address book function on the iPhone. If prompted, choose Delete Contacts on My iPhone.
Step 3: First, power off your iPhone, and then power it on again.
The fourth step is to log into iCloud.com on your Mac to make sure your contacts are still stored there.
Step 5. Repeat step 1 and turn on iCloud Contacts. If prompted, choose "Merge Contacts" from iCloud to your device.
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