I gave my old Apple phone to someone else, and now I send someone an iMessage message. Why did my old mobile phone get it and others got it?

Remove the corresponding associated account in the settings, so that your previous mobile phone number will not be displayed.

The method is as follows:

Click Close in Settings ~ SMS ~ Send and Receive.

1. With iMessage, you can send and receive messages, photos, videos, location information and contact information to any Mac user who uses iPad, iPhone, iPod touch or Mountain Lion. If you have more than one Apple device, iMessage can keep an uninterrupted conversation on all devices. In addition, you can send text messages, photos and videos to other mobile phones through the cellular network. You can even ask Siri to text you. Just say "Tell Xiaoli I'm on my way" and Siri will help you write and send messages.

2. You can send a message to one person alone, to many friends at the same time, and attach your favorite photos, videos or links. Everyone will see your reply. The more people there are, the more information you receive. Hair ecstasy! You use iMessage, and every message sent through WLAN is free.

It is reassuring to know that the sent information has been read and received. IMessage can tell you whether the message has been delivered, and if the receiver has enabled the read receipt, you can also see the read receipt message of the message. When someone is replying, iMessage can also display status information so that you can continue the conversation naturally and smoothly.

4. On iPhone, when the text bubble is blue instead of green, you know that you are using iMessage instead of SMS. You will receive a reply faster; Text message dialogue is free; SMS has been sent to all Apple devices of the recipient; Moreover, the other party has received the short message, so that the short message controller who uses the short message service knows that he will turn blue with jealousy.

References:

Baidu encyclopedia: iMessage