Currently, i am Maxis postpaid user with 4 supplementary line under my account.

I still not quite understand about the past and overdue payment.

Let say, i already cleared all my maxis bill, then today i apply to change to Digi. But while waiting for the porting process to be done, i have to make a call using maxis line. Does this call charges consider as past and overdue payment, and will my application get rejected?