How much is the Singapore calling card?

Just got back from Singapore. Singapore Telecom's calling card 7- 1 1 price 15 Singapore dollars, including 18 Singapore dollars. Dial *363 to open the internet function, and then send a text message for you to choose. There are five options: 10MB $ 1 7 days. Seven days is not limited to $25. I chose 7 days, 1GB, and directly deducted 7 yuan from the phone bill. I can make a phone call with the rest of the money. 3G network signal is not bad, especially in the subway. I only used tens of megabytes of traffic to send pictures in Weibo for three days. . . /zd/ym