IPhone4 is no longer needed, and the mobile phone card is changed to a new phone, but the text messages sent by others can't be sent to the new phone, and they are still on the iPhone.

That's because your original iphone has imessage function. Give priority to imessage when sending messages from other people's iphone, and it will naturally be pushed to your veteran mobile phone.

The easiest way is to log out of the iphone4 account, turn off the imessage function in the settings-information of the phone, and then log out of the account inside.

Of course, the easiest way is to directly restore the ip4 phone to the factory settings, and there will be no account. However, if your phone has escaped from prison in advance, you can't restore the settings, otherwise the phone can't be turned on.