Can I call the recruiting unit directly?

Sure, but you should talk skillfully at different stages of the interview:

1. If you just submitted your resume and haven't informed the interview stage, you can call and ask, briefly introduce yourself and let the other person have an impression.

2. If you go to a round of interview and just wait for the result, you can call to ask about your interview and ask the recruiter your impression directly.

3. HR who informs you of the interview will generally give you his WeChat, so you can talk to him privately to increase your job search opportunities.