How can I become more confident speaking on the phone?

After getting a phone call we feel anxious which may makes miscommunication.To remove anxiety, we have to follow some steps:1.we can write down those sentence what we normally say after receiving a phone call.2. slow speaking is a best way3. After receiving call makes a smile in face and say "Hello".4.our body language greatly influence our mind.so, take your more confidence and comfortable position.

Practice!  Practice makes perfect.  Practice talking about things that aren't important, with people who relax you, like friends and family.  It can be nerve-wracking to only speak with people who are interviewing you, or in a position to hire you.  If there's to be an important call, write down what you want to say, and go to a place where it's quiet where you won't be disturbed and can focus on the call.

Constant practice makes perfect. Also get all the information you require at your finger tips, scribble sentences that you might find difficult remembering. Remember you are in charge and smile