How to send text messages on Apple mobile phone?

Apple mobile phone uses imessage function to send text messages for free. There are two steps: 1. Activate imessage function. Send free text messages

The specific operation steps are as follows:

Find and open the setup application on the phone's main screen.

Find the SMS application bar and click enter.

Click the imessage switch.

Prompt to activate imessage function, and click Agree.

After activating imessage, enter the SMS application.

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

The background color of the free SMS sent is blue.