Zong is acknowledged among the best mobile phone operators in Pakistan. The company always offers convenience to its users through different offers and packages. It is a much annoying situation for any person to receive the calls or SMS from the unwanted person. People often look for ways that they can use to block the calls from spammers or annoying callers. However, on this page, you can check the different methods to block the unwanted calls on the Zong network. The best part is that these methods are free of cost and you do not have to pay any charges to avail this service.