I would think in most cases you would get an email with next steps. SW would also want to set up time with you instead of calling and not getting a hold of you. Good luck with your job hunt.
I know that companies usually send an email first to set up a call time that works for you. If you're not sure about a number that's been calling you, you could try using a reverse phone lookup like who called me to see who it is. This way, you won't miss any important calls and will know who's trying to reach you.
