Talking on the phone isn’t as easy as it seems. Hence practice can be helpful. Not only will this help you rehearse answers to common phone interview questions, but it will also help you realize if you have a lot of verbal ticks, if your pronounciations are clear, or speak either too fast or too slow.
For practice, have a friend or family member conduct a mock interview and record it so you can see how you sound over the phone. Once you have a recording, you’ll be able to hear your “ums” and “uhs” and “okays” and then practice reducing them from your conversational speech. Listening to the recording will also help you pinpoint answers that you can improve.