Never buy Tourist SIM of Singtel. You can't refill...

Never buy Tourist SIM of Singtel. You can't refill or recharge it. 90 minutes IDD for 7 days comes with SIM afterward you can do nothing with it. Ultimately you'll have to buy prepaid sim to refill and make international calls. They're cheat they didn't mention it anywhere on SIM cover. I suffered a lot while in Singapore even went to their office. Their customer service representative are very unprofessional as well. They couldn't help refill my SIM. Buy prepaid sim of StarHub. Maximum tourist use StarHub. In fact StarHub is the largest telecom operator in Singapore. I learned the fact later.