How do I sync my iPhone Contacts with iCloud?
How do I sync my iPhone Contacts onto iCloud from my phone?
iPhone XR, iOS 14
Question marked as
Top-ranking reply
Your question suggests you have no other devices or any data in iCloud.
Turn on iCloud syncing by going into Settings > [your name] > iCloud
then turn on the services you wish to sync. You may find they are already on. Have you checked this?