I am going to study in the United States, and I mainly want to ask my friends in the United States and China what contact they can make.

qq can be used. You can use any contact information you can think of on campus, Weibo and so on.

use the local telecommunications company for phone calls and text messages. The larger ones in America have AT&; T, t-mobile, verizon, making local calls and SMS ok, the mobile phone card is the same. Some plan signed with the above companies can get free mobile phones, but those mobile phones can only use their company's mobile phone card, and they can't change cards unless they are cracked.

You can apply for a SKYPE when you call back to China, and you can use it for a long time (unless you call back to China every day) by charging about $1 into it. Online video is free.

But now that the Internet is so developed, it's really enough to contact your family with skype and WeChat.