How to convert Apple's SMS imessage?

If you want to close imessage, click Close in Settings-Info -iMessage.

The specific operation is as follows:

1. Click Settings;

2. Find information under settings;

3. Then under the information, you can see imessage；;

4. close imessage；;

5. Open the message again at this time, and you can see the text displayed in the input box and turn it into SMS/MMS.