Prepaid customer is eligible to enjoy International Roaming services since its roaming feature already activated automatically. Make sure your IM3 card has enough credit balance to use Roaming services and card is not on Grace Period. You cannot do a call & received call, sending SMS, or using data services when your card is on Grace Period.
Whereas for Postpaid, customer need make sure its International Roaming feature has been activated and card is not on Blocked condition. Please do settle your bill first to start/continue using Roaming services.
Customer able to active his Postpaid Roaming feature by requesting to Gerai and do a deposit Rp1.5 Million or changes the payment method using Credit Card.