If you are unemployed, you need to get your family involved in this very important aspect of the job hunt. They need to be on your side when it comes to a phone interview. Dogs barking, doorbells ringing, babies crying, music in the background, the laugh track from the television, pots and pans clanking -- all these are not good. When you get a phone interview, figure on a quick signal to alert everyone in your home. People (not you) should rush around turning off things and ditching the dog. (Don't ditch the baby, but try to have someone else take care of your young kids, even if it is Big Bird in another room.) Someone should hang a pre-made sign on the door that urges guests not to ring the doorbell. You should retreat, calmly, to a private room, if possible, and close the door.
This room should already be set up for this purpose -- meaning that you have already located the phone, figured out where you'll set or stand, and put a job-hunting folder in a convenient place near the phone so you can find it quickly. Think whether you need a clipboard. Practice rehearsing this, so it goes smoothly. Maybe someone can call you so you can try it all out. Pick awkward times, like 3:15 when everyone is rushing in the door after school, or when you are in the middle of cooking dinner. It's like a fire drill!
If you know the interview is coming, it wouldn't hurt to print out some kind of notes about the place and place it in a folder. I'm thinking about the kind of folder that has two pockets, one on each side. Make sure the folder has some blank paper and a pen that works for taking notes.
On one side, the folder should have your cheat sheet with personal statistics, facts and main talking points about you. On the other side, you should have the company information. You should have a copy of the job description. You should have three to five talking points that relate to the job. You should have several questions ready. Of course, you should go on the company website in advance to review company information. If you can find a picture of the person you are interviewing, that might help you feel more comfortable and connected.