How can I disable shareable data so hotspot cannot be used

[tekarra]

Would like to deactivate shareable data so hotspot can’t be used. How can I do that?

[kb_mv]

@tekarra I found this, you could give it a try. Barring you taking the phone away or putting him on a plan with very little data, there isn't much else to do

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[tekarra]

My child is using this phone. I don’t want him to be able to share data to other devices like a computer to access sites I have restrictions on his phone. So I want hotspot not to work at all on his device. There’s no way to do that on an apple phone—has to be done at the phone service level. 

[slusagm]

not sure what you meant by "shareable" data.  PM data cannot be shared to other PM account

but if you just meant you are "sharing" because of hotspot, you can simply disable hotspot

How to Disable Hotspot on iPhone

Open Settings.
Tap on Personal Hotspot.
Toggle Allow Others to Join to the off position.

or 

Swipe down from the top right corner to open the Control Center.
Long-press the network settings box (top left).
Tap the Personal Hotspot icon to toggle it off.

Prevent Auto-Join: Go to Settings > Wi-Fi > Auto-Join Hotspot and set it to "Never" to prevent your device from connecting to other phones.

How to Disable Hotspot on Android

Open Settings.
Tap Connections or Network & internet.
Select Mobile Hotspot and Tethering.
Toggle Mobile Hotspot to OFF.

or 

Quick Settings Method
Swipe down from the top of the screen.