Zong (China Mobile) has introduced it's postpaid service. It was anticipated that their postpaid packages would be much more cheaper as compared to other operators but they proved it wrong.
Pros
Airtime rate is same for on net and off net calls so you don't have to worry which network you are calling to
Cons
Same interconnect charges are applied to all postpaid packages, in other operators, the more the line rent, the less the call charges for other operators,
Furthermore for packages with more line rent, one ends up paying more for on net call from free minutes.