Do I need a mobile phone network after downloading go SMS?

No, the b-mobile network card is specially used for surfing the Internet on mobile phones. If you need to make a phone call, you should use the hotel. B-mobile network card can access the Internet by unlimited mobile phone for a certain period of time, which is still very powerful. After all, the application of iphone, a smart phone, basically needs networking, especially the Japanese travel shopping mobile phone software, because it needs to use the data of online shopping malls frequently, and the traffic consumption is particularly large ~