Follow the guide posted above. After unlocking it you might have issue when connecting to other carrier s network so be sure they are using compatible frequencies. I'm almost sure you will not be able to connect it to any other CDMA carrier. Normally CDMA carriers will not accept a phone on their network if not sold by them.
Next time if you are planning to switch carriers, buy a gsm phone, much easier! even with a locked gsm phone, you'll only need to sim-unlock the phone with a purchased code then put in any gsm sim card.
Sorry I can't help you more, I'm not familiar with the WLS variant.
