How does Apple use traffic to send text messages?

Apple uses traffic to send text messages as follows:

1. Find and open the "Settings" application on the main screen of the mobile phone;

2. Slide up to find the "Information" application bar, and click Enter;

3. Click the "imessage" switch;

4. At this time, you will be prompted to activate the imessage function and click "Agree";

5. Wait a few seconds, and the "imessage" function has been successfully activated and turned on.

6. Enter the "SMS" application;

7. Enter the other party's Apple ID or mobile phone number, enter the content and click Send;

8. As you can see, the background color of the free SMS sent is blue.