Check the Phone app’s Recent Calls or Call History
Restore from a cloud backup if available
Restore from a local backup if available
Check your carrier’s call records in your account portal
Contact your mobile carrier for call logs
Use data recovery software if the call log was stored on the device
Restore an archived backup to recover deleted call history
Check synced devices if call history is shared across devices
Avoid using the phone heavily before recovery to prevent overwriting data
If needed, visit a professional data recovery service