Can Hong Kong people buy social security without a job?

Hong Kong people working in the Mainland purchase social security mainly by employing units to pay insurance to relevant departments. Suppose Hong Kong people go to work in Shenzhen, I need to sign a labor contract with my company in Shenzhen, and the relevant person in charge of the unit will take relevant information to the local social security agency to handle relevant business and pay social insurance premiums in accordance with relevant regulations.

1. Prepare the Employment Application Form for Taiwan, Hong Kong and Macao Residents;

2. The valid business license or enterprise registration certificate of the enterprise where the party is located;

3. Valid travel documents of the employees to be hired or accepted;

4. Proof of health status of employees to be hired or agreed to be dispatched;

5, the employer's letter of intent or employment certificate;

6. The personnel to be hired are engaged in the technical work stipulated by the state, and the relevant personnel need to provide their professional qualification certificates;

7. Other relevant documents required by national laws and regulations.