The mobile phone number of Su Fu's office already exists.

The phone number of Su Fu Office already exists, which means that the phone number you want to register has already been registered by someone else. You may need to try another phone number or other ways to register. If you try multiple phone numbers, but you still encounter this problem, I suggest you contact the customer service support team of Sufu Office for more help. They may need to verify your identity and provide you with more details.