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To send SMS to a foreign phone number, you can follow these steps in English:
1、Open your messaging app.
2、Input the recipient’s phone number, including the country code. For example, if you want to send a message to a UK number, you should input "+44" followed by the phone number.
3、Type your message in the text box.
4、Click or tap on the "Send" button.
Please note that you may need to confirm your contact information and/or pay for the SMS depending on your service provider and destination country.