ios17, all phones on the same itunes account see call history

You just likely weren't aware everyone could see all the calls. It is NOT a new feature in iOS 17. Not new, at all.

Instead of everyone sharing the same Apple ID, you should be using Family Sharing and each member should have their own Apple ID.

This link explains Family Sharing --> Family Sharing - Apple

Because you’re inviting rampant cross contamination of data. From call logs to contacts, health data, messages, saved passwords, browsing history, credit and debit cards… I could go on…

Accounts should never be shared. Each individual needs their own.

That’s correct. That’s the way it works when you’re using the same account on multiple devices.

Each person needs their own account.

pdunne1 wrote:

4 family members with the same apple account/log in

That is a very bad, terrible, awful idea. Each person needs their own account.

Do you want all four members sharing the same Apple ID to have access to each others text messages? They do and can easily go into settings on their phone and tap each phone number and everyone can read everyone else's text messages. We're not saying you can't share an Apple ID. We're suggesting for privacy, its NEVER a good idea to share one.

pdunne1 wrote:

I actually never set up FAMILY SHARING but it looks like it is now activated. Instead everyone used the same master log in email. So if I turn OFF family sharing will the call history go back to each as their own?

Not as long as you’re sharing an account.

It has ALWAYS been that way, when people share the same Apple ID. ALWAYS.

People have actually been experiencing that for years. I'm not sure why you haven't seen it before now. But, as Kilted Tim mentioned, this is not considered a bug.