[antipaul]

A more lightweight option, though easier to bypass, is to disable apps, App Store, even Safari, with "Content & Privacy Restrictions".

See Settings – Screen Time.

You can use a passcode to lock it. It seems primarily meant for blocking things from your kids.

But it can help turn your iPhone more into a dumb phone

(Blocking safari was the key, for me)

[tines]

He mentions this, says it’s too easy to circumvent.

[nominalprose]

it's not though. See the thread above about having someone else enter the screen time code