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void WTF (how*& implement)

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i have no idea how to approach this sort of function or even what to pass to it. here's a better example:
istream& operator >>(istream& in, PhoneCall*& phoneCall) {
    //is this right?
    //interval is a private member of the class 
    //two values from a file will be read and placed
    //in interval... later
    in >> phoneCall->interval;
    return in;

PhoneCall aCall;
PhoneCall* anotherCall;

cin >> //which variable, how and why

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You would use anotherCall but it'd be a bad idea. Streaming in pointers is extremely non-intuitive. Prefer rewriting the extraction operator to do an ordinary reference.

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struct PhoneCall
std::string number;
unsigned int minutes;

std::istream& operator>>(std::istream& is, PhoneCall& call)
is >> call.number;
is >> call.minutes;
return is;

std::ostream& operator<<(std::ostream& os, const PhoneCall& call)
os << call.number;
os << ' '; // Don't forget the field separator!
os << call.minutes;
return os;

PhoneCall call;
std::cin >> call;
std::cout << call;

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