If you need to upgrade the 4G package, the number must be registered with the second-generation 18-digit ID card. It may be that the personal information registered with this number cannot pass the system verification and needs to be improved before it can be operated. I suggest you consult the local customer service first to check the relevant information of this number.
Reminder: 4G national unified tariff, no matter where you go! Please click /sAbMR for details of 4G national package upgrade.