Why is iPhone SMS green and blue?

Blue indicates that the message sent out is sent through iMessage, which does not generate SMS charges and takes traffic. In iMessage mode, if the message fails to be sent, it will be automatically sent by SMS.

And green means sending short messages, and the information sent out is charged according to the operator's tariff.

If you want to send it all by SMS, just turn off iMessage in the settings.

1, open the settings first.

2. Then click "Info".

3. At this time, you will see that your iMessage is open.

4. Click the button to close iMessage.

At this time, texting is no longer in the form of iMessage, but ordinary SMS.