Hi @zuolf, StarHub Mobile postpaid customers who subscribe to either International Roaming or Pay-As-You-Roam service are eligible for this Promotion. If you're currently subscribed to Pay-As-You-Roam, the 20% surcharge will be applicable on top of prevailing Pay-As-You-Roam rates.
More details can be found here.
To subscribe, send me a private message with your StarHub Account Number, NRIC/FIN, mobile number and email address, we can get it activated for you. -Jolene