How to set green or blue for iPhone SMS?

How to set green or blue for iPhone SMS? I believe many users still don't know why Apple's short messages are green and blue. The following unified small series will share with you the method of setting iPhone iMessage. Come and have a look if you are interested. 1. The messages displayed in green belong to the messages of traditional operators, that is, they are generally charged according to the number of messages. There is no limit to the sending of this short message, and it can be used regardless of the mobile phone model. 2. As shown in the figure below, the background color of the SMS you sent is green, indicating that you are currently using SMS from traditional operators, namely mobile, telecom and Unicom. In addition, you can also see it in the text input box of the short message. SMS/MMS? The implication of this word. 3. Next, the text message with blue background is highlighted, as shown in the figure below. In fact, this is a service provided by Apple for its own devices, which sends information through the network for free, that is, iMessage information, whether using wireless network or mobile network. 4. Of course, certain conditions are required when sending information with blue background. First, you must use Apple iPhone to open the iMessage function service in Settings-Information. As shown in the figure below, as long as you are currently using an iPhone, you can turn on this function yourself.