u just call 123 or go to nearest maxis center to check. I that if your contract left 4 months,you can apply to cancel and replace with new contract.

Ok.. Let me put it this way. I'm also the same as you ppl. I'm a maxis postpaid customer. But due to a contract, I cannot sign for idata/ivalue plan. The sales girl at Maxis ask me to go for prepaid plan or go for a sub line plan. But in the end I choose for prepaid plan. That's the same thing. When you book for prepaid plan,i think you have to enter a registered prepaid number inside. It's a wise thing to purchase a prepaid and activate/register it before you book for prepaid. If not,you can do it at maxis center straight forward.