How to use two calling cards at the same time?

1, this kind of mobile phone usually has a primary card and a secondary card by default;

2. When making a phone call, there will be two dialing keys, which respectively represent two cards to dial;

3. When sending a short message, after editing the short message, there are two send buttons, corresponding to two cards respectively;

4. Generally, the main card is used by default when surfing the Internet. If you need a secondary card to surf the Internet, you need to switch to dual-card management in the settings.

Note: A mobile phone that supports dual card dual standby can use two cards at the same time.