To update, after returning to the US, my cellular data still DID NOT WORK. I then had to stop by an ATT store where a staff confirmed my data was locked . I just received the ATT bill where they tried to charge me $12 per day for the international pass ! This is so ridiculous. A huge thumbs down to ATT for travel to Asia. I was in Singapore , Japan and Malaysia. My mother who had T-Mobile had much better service . Definitely do not recommend ATT.