Why can ipad also receive text messages received by Apple's mobile phone?

You can cancel your account in icloud settings.

1. Because the same Apple ID is used, if you send a text message with imessage, any device with the same Apple ID can receive it. Cancel the device ID that you don't need to receive. I feel that texting with imessage is just like sending an email.

2. First of all, iPhone, ipad and Mac all belong to Apple's products, so the systems used are all Apple's IOS and Mac OS systems, which are interrelated. Messages sent between Apple devices can also be realized through Apple's own imessage.

3. If both iPhone and ipad turn on imessage function and log in with the same Apple ID account, the sent messages will be displayed synchronously on all devices.