What should I not do when I have a telephone interview?

Remember that even though you are on the phone it can still pick up surrounding noises so it is important that you think about your environment - so definitely not in the pub - and do not eat or multitask while on the phone. It can be extremely distracting for all involved if there is a lot of noise on either side of the line, so make sure that you can hear each other clearly.

For more tips about telephone interviews read this article; 

Maarten Karremans