Contacts
I need assistance with getting my old contacts on my iPhone back
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If you were syncing contacts with iCloud, see this for help. You will need to use a computer or an iPad to do this.
Restore contacts stored in iCloud on iCloud.com - Apple Support
If you were including contacts in your backups rather than syncing them with iCloud, you can restore a backup that contains the contacts. When you restore a backup, you overwrite the current contents of the device and replace them with the contact in the backup.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support