Telephone interviews can be quite nerve-racking, so just remember to keep calm. Keep all paperwork and important documents you may need in front of you, as this will help you to avoid having to rush off for a moment to get necessary papers or flick through a pile in order to get the one you need, thus making you seem not very organised.
Employers do scrutinise almost everything in interviews, including telephone interviews, so remember to be sharp and alert even though it’s over the phone.