You'd need to get copies of billing statements from whatever period you wanted to review the call history. Unless it's changed, there's a $5 charge for each statement provided, assuming Customer Service still provides them.
kcallow6180, your fellow community member, tikibar1, hit the nail right on the head. We do have options for bill reprints beyond 18 months however there is a $5.00 reprint charge. TakendraW_VZW