How does Huawei nova7 dual card dual standby?

Huawei nova7 is dual card dual standby.

Remarks: At the same time, the dual-call function can be supported in the following scenarios: * During the call of one card VoLTE, another card VoLTE can call, and you can choose to answer the new call and hang up the original call. * During the secondary card VOLTE call, the default mobile data main card can access the Internet at the same time (if the main card is a telecom card, VoLTE needs to be enabled). * In some network environments/geographical locations, the above functions may not be used due to the interference of carrier's network frequency band.