The phone number on the business card given by the recruitment company always stops. Is it necessary for me to visit the company?

It is not necessary in theory, but it does not rule out the temporary arrears of small company landline;

If you are close, you can have a look.

I'm also looking for a job these days. Imagine that I can't contact the phone number left by the recruitment, which shows how irregular this company is; Moreover, in general, this kind of telephone in large companies is monthly, and there will be no temporary downtime and most line failures.