ShadowDash, the best way is to restore your iPhone from a recent backup if you have one. Check if you backed up to iCloud or iTunes before the calls were deleted. Restoring from backup will bring back your call logs. Without a backup, it’s tough—Apple doesn’t keep deleted call history for you. Avoid third-party apps; they often cause more harm than good. In future, regularly back up your phone to save important data. Stay calm, and take it one step at a time.