How to insert Apple 13 dual card dual standby?

In the Apple 13 mobile phone, you can take out the Cato by using the card pin, and you can put two cards on the front and back of the Cato to realize dual-card dual standby. The card insertion method is as follows,

Use the bayonet to open Cato, which is located at the lower left of the phone.

Take out your mobile phone card and put it away.

Turn Cato upside down and you can put the secondary card.

Matters needing attention in dual-card use

1, set the main number as the default number, then the main number can do anything (including surfing the Internet) and it is the default number; At this time, the minor number can only answer the phone, receive short messages (no internet access), or temporarily select the minor number manually when making a phone call or sending a short message (if it is not manually selected, the major number will be used automatically).

2, set the minor number as the default number, that minor number can do anything, and the main number can only answer the phone and receive short messages, that is, the other way around.

3. Another function of the secondary number is to set the secondary number for surfing the Internet. After this setting, the main number is used to do other things besides surfing the Internet (of course, it can also be temporarily changed to a secondary number manually when calling and sending text messages, otherwise the main number will be used by default).