How can I tell if someone has sync their iPhone to mine?
iPhone 8 PlusHow can I tell if someone has Sync Their phone to mine
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The only way to sync another phone to yours in even a partial sense would be for the other device to be using your Apple ID and password and using your iCloud services.
Click on this link "If you think your Apple ID has been compromised" --> https://support.apple.com/HT204145
'Checklist: If you want to see if anyone else has access to your device or accounts' click here --> https://support.apple.com/HT212021
Security and your Apple ID - https://support.apple.com/HT201303
Contact Apple for help with Apple ID account security - https://support.apple.com/HT204169 "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues." Better for directly reporting an issue.