Sign into your MyVerizon account online as the account owner and view the call logs.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
Just like our community members suggested, your monthly bill would show a full call log (check online in My Verizon when the bill is available), based on the area the call started and ended in. If wanted a little bit more visibility on what your son is doing on the phone though, check out FamilyBase: http://vz.to/2hoLbJE . Some things are still hidden, like contents of text messages for example, but you can manage blocks and see usage information anytime. In that link I shared, check out the "Viewing Your Family's Usage Information" to see if this might be for you.
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