Can I resign by SMS if I don't sign the contract?

You can leave your employer at any time. Article 10 A written labor contract shall be concluded when establishing labor relations. If a labor relationship has been established and a written labor contract has not been concluded at the same time, a written labor contract shall be concluded within one month from the date of employment. Article 38 A laborer may terminate the labor contract under any of the following circumstances: (1) Failing to provide labor protection or working conditions as agreed in the labor contract; (2) Failing to pay labor remuneration in full and on time; (3) Failing to pay social insurance premiums for laborers according to law; (4) The rules and regulations of the employing unit violate the provisions of laws and regulations and damage the rights and interests of workers; (5) The labor contract is invalid due to the circumstances specified in the first paragraph of Article 26 of this Law; (6) Other circumstances under which the laborer can terminate the labor contract as stipulated by laws and administrative regulations. Article 82 If an employer fails to conclude a written labor contract with the employee for more than one month but less than one year from the date of employment, it shall pay the employee twice the monthly salary.

legal ground

Article 82 of People's Republic of China (PRC) Labor Contract Law? If the employer fails to conclude a written labor contract with the employee for more than one month and less than one year from the date of employment, it shall pay the employee twice the monthly salary. Where an employing unit violates the provisions of this Law and fails to conclude an open-ended labor contract with the laborer, it shall pay the laborer twice the salary every month from the date when the open-ended labor contract should be concluded.