Data only SIM restrictions

Hi,

I'm considering ordering a data only SIM, as a group owner for use in a phone, but the restrictions on a data only SIM seem a little unclear, if anybody could clear these up, it'd be great:

1. The phone wouldn't be able to make calls or text (SMS/MMS) period? (WhatsApp etc will still work) what about WiFi calling, what about RCS?

2. Can the device receive calls at all?

3. It appears there are out of plan allowances, would it be possible for the user of this SIM to trigger a calls add on, without my consent as the group owner?

A little context to what I'm trying to achieve:

I currently pay for a calls and data SIM for my daughter, she's 12 and somewhat defiant.

I have parental controls on her Samsung phone, using the Family Link app, it locks her phone at 9:30pm on school nights and 11pm on weekends and holidays.

I have parental controls on her WiFi only iPad, using the same schedule.

I have parental controls on the mesh network. Using the same schedule.

Presently there are a couple of weaknesses in this strategy, and kids are great at solving problems when it benefits them. 'm hoping a data only SIM can solve one of them. 

When everything cuts off at 9:30pm the expectation is she goes to sleep. Family Link does not completely block the phone, it still allows the child to make and receive calls (Safety feature, they say). My child seemingly cannot grasp this concept of it being sleep time and discovered she can still make calls, beyond sleep time.

Mornings aren't fun, she's tired and moody as she breaks the rules.

Initially I had to physically remove the devices from her room, but sometimes I nod off watching telly, sometimes I forget and in reality the rules are the rules, she needs to learn to accept them and I need to be able to trust her to do so.

So, I'm obviously not here for parenting advice, I just want to know what hapoens when I get a data only SIM. Is it completely impossible to make or receive calls? If that is true, is there any way that she could buy a bolt on etc, without my explicit consent?

Obviously given the context I provided, I want it to be impossible to make and receive calls and also impossible for her to upgrade to a calls package etc.

Thanks 😊