What number should I put in front of my mobile phone number when sending a text message to an American friend?

If you send a text message or make a phone call to a mobile phone number in the United States, you need to add 00 1 in front of the text message and phone number before sending it out and receiving it. 00 1 is the international area code for the United States.

The telephone number in the United States is the same as that in Chinese mainland. The first three digits are the area code, and the last seven digits are local numbers. All telephone numbers in America are in ten digits. If your area is the same area code as the area you want to call, you can just dial the last seven digits. But if you are not sure, you can put the area code in the same area code. Use landline to make calls between different area codes. When calling a mobile phone or a landline, always add 1 before the number 10. It doesn't matter if you make a phone call. If you call the United States from the mainland, the number is 00 1+ U.S. area code +7-digit telephone number.