Is there a charge for Unicom's secondary card?

All local voice calls between the master card and the slave card are free.

Unicom's data secondary card is not the No.1 dual card, but the essence is unified billing. The secondary card can only be used for data access, and does not have communication functions such as short message and call. It only supports domestic data roaming, similar to the USIM card in the 3G wireless network card.

Opening the data daughter card business requires paying the 5 yuan function fee every month. After that, the data secondary card and the main card use the same package and tariff.

It's just that the data secondary card only has the function of surfing the Internet, and you can only use the main card when you need to use the phone and SMS.

The data secondary card service is a new service specially developed for Unicom users to make full use of the data traffic in the package. Take Unicom iPhone 4 users with a monthly fee of 286 yuan as an example. The monthly data flow in the package is 1gb. If you use it alone on the iPhone 4, it may not be used up every month. Now that the secondary card has been introduced, the unused traffic of the mobile phone can be used on terminals such as notebooks and iPad, so that the user's package fee will not be wasted.

In addition to making full use of the package traffic, the main card and the auxiliary card are charged uniformly, and the two cards do not interfere with each other. The secondary card can only be used for data surfing, and has no functions such as short message and call, and only supports domestic data roaming, similar to the USIM card in 3G wireless network card. Therefore, there are no hidden dangers such as charging errors or privacy exposure when users use data daughter cards.