I'm going to apply for immigration, but the work certificate is run by a company looking for a friend. If it's just a phone check, it's definitely no problem.

In theory, there is door-to-door verification, but the actual situation is basically telephone verification, and as long as your friend's company prepares your resume and work details in advance, it will not be a problem if your friend answers the phone. However, if it's not your friend who answers the phone, the answer is that you don't know that you work in this company. People who have many years of experience in verification, even if they don't come to the door, can usually judge your authenticity by using the impassable time of telephone inquiry, the different objects of inquiry and the specific details of inquiry work. Be careful to sail for thousands of years, it is better to be fully prepared.