What's the difference between blue and green when Apple sends text messages?

Hello, the messages displayed in green when Apple mobile phones send messages belong to 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. This kind of short message is used by traditional operators, namely mobile, telecom and Unicom. In addition, you can also see a prompt with the words "SMS/MMS" in the SMS text input box.

Blue SMS is a service provided by Apple for iOS devices to send information through the network for free, that is, iMessage information, whether using wireless network or mobile network. This kind of short message can only be used if both parties use iPhone, and both parties have opened iMessage service and have network connection.

There are also some tips when using iMessage information. When you encounter network signals from time to time, there will be a problem that information cannot be sent. Therefore, in the setting interface of iMessage, that is, Settings-Information, you can turn it on as an option to send short messages, so that when the network is not smooth, the system will automatically switch from iMessage to traditional short messages without delaying the sending of information. In addition, when sending an iMessage message, you can also switch by pressing and holding the message being sent and selecting the option to send it using the short message service.