Normally a pin is used to prove that you are the rightful owner of your account when you call Koodo. It is also used to listen to your voicemail from another phone. Never, ever give your pin out over text messages or to anybody who asks for it (except the agent when you call CS yourself).
This is my first phone so I wouldn't be listening to voicemails from another phone. I already set up a PIN for my Self-Serve account. How is this one different? Can I change this PIN, and if so, how do I do that?