How to switch between primary and secondary cards when sending text messages on Apple mobile phone?

Apple's method of switching the primary and secondary cards through SMS is as follows:

Mobile phone: iPhoneXR

System: iOS 15.2. 1

Software: Set 1.0.3.6.

1. First, open the Apple phone and enter "SMS".

2. Click Write SMS to edit the content of SMS.

3. Click the sender. After clicking, you can switch between the primary and secondary cards to send short messages.

Characteristics of dual card dual standby function

1 and dual card dual standby function can improve communication efficiency.

Apple's dual card dual standby function allows users to keep the ability to answer another call while answering the phone. When the user is using one phone, if another phone calls, the system will automatically transfer the current phone to the background so that the user can answer the other phone. The realization of this function can improve the communication efficiency of users and facilitate users to handle multiple mobile phones.

2. Dual-card dual standby function can improve communication security.

Apple's dual card dual standby function can bring users a safer communication experience. Users can use one phone number for work or business purposes, while the other phone number is used for private communication or social entertainment, thus effectively isolating work and life. In this way, users can better protect their privacy and security and avoid information leakage and property losses caused by communication leakage.