What kind of calling card do you need to buy when traveling in America?

The main calling card in America is AT & amp； T, T-mobile and so on. ，at & amp； T signal is the best but expensive, and T-mobile signal is generally but cheap. American calling cards bought in China are generally easier to make American calls, and there is a time limit for making domestic calls. If you just surf the Internet, use WeChat, etc. , recommend T-mobile. If you want to play games, I suggest AT & amp； t .