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To send a text message to a US phone number, you can follow these steps in English:
1、Open your messaging app on your phone or computer.
2、Input the recipient’s phone number, making sure to use the correct country code for the United States, which is "+1".
3、Type your message in the text box.
4、Send the message by clicking or tapping the "Send" button.
Please note that you need to ensure you have the necessary credit or data plan to send international text messages, and that the recipient’s phone is capable of receiving text messages from overseas. Additionally, depending on your service provider, you might need to follow any specific guidelines or procedures for sending international SMS.