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

Opening iMessage and logging in with the same ID will result in sharing SMS with another mobile phone.

The specific steps to cancel SMS sharing are as follows:

1. Click the Settings icon on the home screen, and then click Info;

2. Click "Send and Accept";

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