When you first reached out to the companies you are considering, how easy was it to get in contact with them? Did it take hours, days, or weeks for them to return your call or email? If it is challenging to get in contact with a company, you can expect similar or even worse behavior in the future.
You need a company that will answer the phone when you call, email you back in a timely manner, and follow-up with information that you request. Don’t ask, but observe for yourself and see how accessible the people are at the companies you are considering to hire.