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To call a domestic phone number from a U.S. mobile phone number, you can follow the country code format. The country code for China is 86, followed by the area code and the specific phone number. So, the format would be: + Country Code (86) + Area Code + Phone Number.
In English, it would be: "+86 (China Country Code) + [Area Code] + [Phone Number]". For example, if you are calling a number in Beijing, and the area code is 10, the format would be "+86 10 [Phone Number]". Remember to use the international dialing prefix, which is the "+" sign, before the country code.