If you successfully receive the acceptance notice, you can receive other notices. In the absence of an entrusted agency, the patent office and the applicant rely on the most primitive method of communication - registered mail. With nearly 10 million patent applications filed every year, it would be exhausting to make phone calls. You can take the initiative to call the Patent Office and check the application progress by the application number. The service phone number is on the homepage of the State Intellectual Property Office.