There are 2 current processes with applying for their call center positions. Online and sometimes during large hiring they allow walk ins.
There are some general computer tests they have you take to make sure you understand the world of customer service (pretty easy) and then they have you take an audio test where you listen to scenarios and answer questions based upon what you heard (take notes and write small)
Lastly they have you take a 1 and 3 minute typing test. They are looking for around 30-35wpm, I averaged 65 so that wasn't too much of a concern.
If you pass all of those then you move onto the first interview which is mainly them going over your resume and ask a few scenario question (ie how would you handle an upset customer)
If you seem like a fit after they explain the position then you meet with a supervisor of the account you are in line for.
That interview is pretty much the same as the first however they have more info on the account you would be working with so ask questions.
If both interviewers give you the thumbs up you get offered the job on the spot and setup for a drug and background test.