Iphone 7 sends text messages in blue, how to change it back to green?

Method 2: Close imessage.

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. Explain that the short messages of traditional operators are currently used, that is, mobile, telecom and Unicom. In addition, you can also see a prompt with the words "SMS MMS" in the SMS text input box.

The background color is displayed as a short message in blue. 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. In addition, the other party also uses Apple's mobile phone. After opening the iMessage service, they can send free messages to each other. It is worth mentioning that you can not only send free iMessage blue messages between iPhone, but also send messages between iPod Touch, ipad and Mac, as long as both parties enable iMessage service.