Urgent ~! ! ~ The United States sends text messages to China.

Call ChianUnicom. When I was in America, I sent it directly to my friends at home. You can send them all. Did you buy your mobile phone in China or the United States?

I suggest you send it to another friend. If your friend can't get it, that's your problem. Check whether the format is wrong or what is set inside the phone. If some can receive it and some can't, it's your friend's phone number. Was it rejected or something else? Let him ask the local Unicom company.