Here’s my take on this.
I can see a couple of different approaches, each with its own set of trade-offs.
Given that you share device access, the most straightforward path is to use the phone’s native functionality. You can review the call history directly in the “Recents” tab of the Phone app. Alternatively, many mobile carriers provide detailed call logs through their online account portals, which would offer a record that can’t be altered on the device itself.
The other option is to use a dedicated third-party monitoring application. These tools are designed to discreetly sync call data to a separate dashboard for you to review. The advantage is that they are more comprehensive and operate in the background. The downside is that they usually involve a subscription fee and a more technical setup process.