How does Apple's 6s phone cancel sharing with another SMS?

Sharing SMS with another mobile phone is caused by opening iMessage and logging in with the same ID.

The specific steps to cancel SMS enjoyment are as follows:

1. Click the "Settings" icon on the main screen and click "Information";

2. Click "Send and Accept";

3. Under the option of "Use when starting a new conversation", the device can cancel SMS enjoyment by checking the "mobile phone number".