Why are the text messages sent by Apple's mobile phones different in color? Android can't accept it.

There are two types of SMS on Apple's mobile phone:

The first category is normal short messages, and the color is green. As long as the other party's mobile phone doesn't stop, all mobile phones can receive it, no matter whether your mobile phone is Android or ios.

The second type of SMS is imessage, and the display color is blue. The recipient of this short message must also be an ios system, and the mobile phone must be connected to the Internet. Android phones can't receive such messages.