Check the Phone app’s Recents tab
Use the search bar in the Phone app if available
Restore an iPhone backup from iCloud that contains the call log
Restore an iPhone backup from a computer using Finder or iTunes
Check call history on your carrier’s account portal or app
Contact your carrier to request call records
Check synced call history on other Apple devices using the same Apple ID
Use third-party data recovery software if the calls were recently deleted
Avoid making new backups before trying recovery
Keep the iPhone connected to Wi-Fi and power during backup restoration