I believe maxis is not only not ready for their billing system. Their 3G system suck big time recently. My friend subscribes to the Maxis unlimited plan and has problem on using the mail function in iPhone. I did a check on his network / email settings. Everything is fine. It just didn't work. When he calls Maxis, they said they are in the midst of upgrading their 3G services. Probably that's in conjunction with the iPhone readiness and launching!