Apple mobile phone sends text messages in blue and green.

Green and blue represent SMS and 1 Apple messages sent and received by operators respectively.

Green SMS The messages displayed in green belong to traditional operators' messages, and 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 model of the mobile phone.

This kind of short message can also see the prompt of "SMS/MMS" in the short message text input box. BlueSMSBlueSMS is Apple's service for iOS devices. Whether using wireless network or mobile network, you can send information through the Internet for free.

This short message can only be used if both parties use iPhone, open iMessage service and establish network connection.

Extended data:

IMessage is very similar to MMS. It not only allows users to send text to other iOS and OSX users through Wi-Fi, 2G, 3G or 4GLTE, but also can transmit documents, images, videos, locations, contact information and group information, which is great for most devices and can provide standard SMS and multimedia SMS services together with iOS5 and higher versions.

IMessage can be used through the "message" program on iPhone, iPad, iPodtouch running iOS5 and Mac computer running OSXMountainLion.

Owners of these devices can register multiple email addresses on Apple's network. If the communication carrier supports it, the iPhone owner can even use this phone number to register an Apple account.

In the message program, users can see the input status of iMessage users at the other end. When the other party starts to reply, a light gray ellipsis will appear in the message prompt box. After starting personalization on one iOS device, users can continue to send information on another device.

Some specific functions of iMessage are available in iOS5 or later or OSXMountainLion or later, but only on iPhone can messaging programs send text messages to devices that are not on iOS system or temporarily unable to use iMessage.

On the iPhone, green buttons and bubbles indicate that the current communication is based on SMS. On all iOS devices, blue buttons and bubbles indicate that messages are currently being transmitted through iMessage.

If the receiver activates the "reading feedback" function, the sender will be able to see that the former has read the information.