If you are particularly demanding on working hours, I suggest that you have enough time before work. No unit likes to find someone who can't spend all his time in the company.
Remember not to ask too many questions on the phone. Generally, HR will notify many people at a time. Generally speaking, he won't answer too many questions, which will easily lead to a bad impression and miss a good job.
Finally, in fact, you can learn about their company online first!
I hope I can help you!