There is no way to charge the phone charge to the sub-card, the money on the sub-card can not be transferred to the main card, and can only be recharged to the main card.
The advantage of the mobile sub-card is that the traffic sharing, talk time sharing, the main sub-card does not charge and does not need other monthly fees, the mobile sub-card does not contain other monthly fees, so if your family needs to use the call and traffic, it is more economical. The disadvantage of moving the sub-card is that it may cause the signal of the main card to deteriorate, and the main card can query the call history of the sub-card.
Extended data
If the home network signal is poor, you can use the sub-card as a home network, just buy a 4G wireless router or CPE, plug and play, WiFi to share with the whole family. The secondary card follows the main card to stop and resume the machine, if the main card stops the secondary card can not be used, it is recommended to pay for the main card as soon as possible. If the secondary card is lost, after the secondary card is replaced, the main card customer needs to re-bind the primary and secondary cards before continuing to use them.
When you query the bill details in any way, the traffic is mixed with the primary and secondary cards, and is not provided separately. Only the master and secondary card details and billing inquiries are provided to the master card, and the secondary card inquiries are not provided to the master card.