iPad phone costs.

I have an iPhone XR and an iPad A1823 that has phone capability, both on my Verizon account. I pay Verizon $10 a month for the iPad to be linked on my account and it even has it’s own number, albeit that number is never used. I asked Verizon why I pay that and what I get for this fee. Naturally I can’t get a straight answer so I need Apple expertise.

If I remove the iPad from my Verizon account, what abilities will I lose? Verizon did say that I still can utilize the ‘hot spot’ feature but that was it. Why do I have the iPad on my Verizon phone account it it does not give me extra capabilities? It is only $10 a month but that is $120 a year!