If the number has signed a contract agreement, it is generally impossible to change the low-end package during the contract period. You can apply for the same or higher-end package, and you can choose to change it freely after the contract period ends. In addition, the rules in different provinces are slightly different. For details, please check the network access documents or consult the local service center. Not enough traffic? Half a year's traffic is easy to get! The flow is not cleared across months and is valid for half a year. Click /sAAGl to enjoy a 20% discount.