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To send a text message from Macau to mainland China, you can follow these steps:
1、Open your messaging app on your phone.
2、Input the recipient’s phone number, which should be in the format of a mainland China phone number.
3、Type your message in the text box.
4、Send the message as you normally would.
Remember to use the correct phone number format and ensure that your phone is properly set up for international messaging. There may be additional charges for sending messages to mainland China depending on your service provider and plan. Please check with your service provider for more information.