It’s a good practice for each of your team members to have their own personal business phone numbers. There are many reasons why they shouldn’t use their personal cell phone number for business, so you’ll want to give them their own phone number through your VoIP provider or phone system.
Recently one of my students asked a great question about voicemail in English and I thought that you might have the same question as well.

As a real estate professional, you're always on the go. Whether showing homes and apartments to a prospective client or staging a home for sale, it's likely that you're out of the office quite often. Anyone in the industry knows that, out of the office is a good place to be. Unfortunately, it makes staying professional just a little bit harder. What happens when you're working with one client and another one calls? Most likely, you send that call to your voicemail box, but what does your voicemail greeting say? What should voicemail messages include? If you're voicemail isn't offering the right information, you might lose a sale.
7. Could you suggest some voicemail greetings, I’m all out. It would be better if you left it to me as a message after the beep.