If you have a backup, you can recover them through iTunes and iCloud, if not, you also can recover them through some third-part software,
Some software is very powerful that can recover photos, videos, contacts, messages, notes, whatsApp and more. More details you can see:
17 Best iPhone Data Recovery.

The easiest way to restore call history is to restore from iCloud or iTunes. However, if you haven't backed them up via iTunes/iCloud before. LazePaw iPhone Data Recovery is the best option to get the deleted call history from iPhone, iPad.

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