You have to pass mock telephone calls before moving onto a face face interview. You just need to make sure you take information down correctly and ask them to spell things if you're uncertain

-3 mock call assessments -1:1 interview The process was very straightforward and you are made to feel at ease throughout. If you pass all three mock calls, you move on to a 1:1 interview where you are asked a series of questions. Informal setting. Pleasant experience.