... but texting has always been green and can't be changed to blue imessag

The blue message is an iMessage conversation, which requires: a) connecting to the network and activating iMessageb) initiating a conversation with an Apple user who has iMessage open at the same time. In other words, if the other party doesn't open iMessage, it will also be sent to the other party by ordinary SMS, so please try to send it to more friends.

The blue message is an iMessage conversation, which requires: a) connecting to the network and activating iMessageb) initiating a conversation with an Apple user who has iMessage open at the same time. In other words, if the other party doesn't open iMessage, it will also be sent to the other party by ordinary SMS, so please try to send it to more friends.

: The iMessage service is not activated on your iPhone. You can click "Settings"-"Information" and see if this function is turned on.

Bubbles will be blue; When the network signal is bad, or the other party is not an Apple user, or the IMESSAGE function is not turned on, the information bubble will be green. Specific steps: When their mobile phones are all Apple phones, the short messages sent to each other are upgraded to imassage, and the information turns 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.