Is there any reliable way to see my child’s iPhone activity? Any built-in features or monitoring tools? I am open to all suggestions!
No, the iPhone security system doesn’t allow you to track anyone’s activity. No matter what tool you use, it’s simply not possible. All you can do is talk to your child and make them aware of your concerns why you want to see their phone activity. 
Honestly, it is possible, but due to Apple’s sandbox system, you have to opt for monitoring apps. This is the only way you can track their activity and see what’s up with their phone usage.
I started using Xnspy, and it has given me such relief. I have access to almost everything happening on my child’s phone. One good thing is that Xnspy offers remote control features where you can remotely block any app access if you deem it inappropriate for your child.
With that, the web history keeps me updated on their browsing habits and what kind of content they are consuming. The app offers other features as well, which you can check out yourself.
There are plenty of built-in parental monitoring features that iOS offers. I’d suggest using them. They are pretty useful, and you can monitor their screen time, block app access, grant permission for app purchases, and much more. Here is an easy breakdown for you to understand.
Apple Screen Time
What you can see
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Apps they use and how long they use them
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Screen time by day/week
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App categories (social, games, education)
What you can control
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App time limits
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Downtime (phone locked during sleep/school hours)
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Block or allow specific apps
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Restrict explicit content and in-app purchases
I tried Apple’s Screen Time along with a few parental control apps on my kids’ phones. Screen Time is useful for checking app usage and blocking certain apps, but it’s fairly basic because you can’t see things like browsing history or messages.
For more in-depth oversight, Xnspy stood out for me since it covers web activity, social media use, and sends real-time alerts. I tested it with my son recently and was quite satisfied with the quick SIM logs updates.