Q: Two iphones one iCloud account - same call history?

You shouldn't share your Apple ID with anyone else. Sharing your Apple ID will cause issues like this with your information including call history, contacts, photos, device backups, and more, and leads to confusion about who actually owns the account.

Frequently asked questions about Apple ID - Apple Support

Create a second Apple ID for yourself or your wife. You can share photos with iCloud Photo Sharing. For example, if you create a new Apple ID and your wife keeps the old Apple ID, she can subscribe to your shared albums to view them on all of her devices, leave comments, and get notified automatically when you add new photos and videos.

iCloud Photo Sharing FAQ - Apple Support