How do I recover all my phone contacts ??
Lost my phone contacts within the last week
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If you are using iCloud, make sure you have contacts set to sync.
Change your iCloud feature settings [iOS and Mac] - Change which apps sync and store data with iCloud - Apple Support
If you accidentally deleted your calendars, reminders, bookmarks, or contacts from iCloud, read this support article --> If you accidentally deleted your calendars, bookmarks, or contacts from iCloud - Apple Support
This article has similar information --> Restore contacts stored in iCloud on iCloud.com - Apple Support
If you do not use iCloud for Contacts you may be able to restore from a backup but that entails resetting your entire device back to the time you made the backup.
Read this document to discover how to restore your iPhone, iPad, or iPod touch from a backup --> Restore your iPhone, iPad, or iPod touch from a backup - Apple Support